Much of the best information on using green leaf crops is in out of print or hard to find books. Many of these can be located through university libraries or through inter-library loans. Sometimes out of print books can be purchased through large on-line booksellers, such as Amazon.com or Barnes and Noble.
Accessible Gardening for People With Physical Disabilities: A Guide to Methods, Tools, & Plants, by Janeen R. Adil, 1995, 300 pages
Botany for Gardeners: An Introduction and Guide, by Brian Capon, 1992, Paperback, 220 page
Breed Your Own Vegetable Varieties: Popbeans, Purple Peas, and Other Innovations from the Backyard Garden by Carol Deppe, 1993, Paperback, 303 pages
Four-Season Harvest : How to Harvest Fresh Organic Vegetables from Your Home Garden All Year Long, by Eliot Coleman, Kathy Bary (Illustrator), Barbara Damrosch, 1992, Paperback, 224 pages
The Garden Primer, by Barbara Damrosch, Ray Maher, 1988, Paperback, 673 pages
How to Grow More Vegetables : Fruits, Nuts, Berries, Grains, and Other Crops, by John Jeavons 1995, Paperback, 175 pages
The Leaves We Eat: Handbook #31 by John M. Bailey, Published by the South Pacific Commission, Noumea, New Caledonia, Paperback, 97 pages, Out of Print
The Miracle Tree Moringa Oleifera: Natural Nutrition for the Tropics by Lowell J. Fuglie; 1999; Church World Service; Dakar, Senegal; Paperback; 66 pages; ECHO
The New Organic Grower: A Master's Manual of Tools and Techniques for the Home and Market Gardener, by Eliot Coleman, Sheri Amsel (Illustrator), Molly Cook Field (Illustrator) 1995, Paperback, 304 pages
The New Oxford Book of Food Plants by B. E. Nicholson (Illustrator), John G.
Vaughan, Catherine Geissler, 1998, Hardcover, 256 pages
Seed to Seed, by Suzanne Ashworth, David Cavagnaro, 1995, Paperback, 222 pages
Square Foot Gardening : A New Way to Garden in Less Space With Less Work, by Mel Bartholomew, 1981, Paperback, 347 pages
Your Organic Garden (A Rodale Garden Book), by Jeff Cox, 1994, Paperback, 344 pages
Leaf Protein Concentrates, by H. Graham and L. Telek, ed., AVI Publishing Co. Inc., Westport, CT USA, 1983, Hardback, 840 pages, Out of Print
Leaf Protein and Its By-products in Human and Animal Nutrition 2nd Ed. by N.W.. Pirie, Cambridge University Press, Cambridge, UK, 1987, Hardback, 209 pages, Out of Print
Biochar Systems for Small Holders in Developing Countries, by Sebastin Scholz. et. al., 2014
The Carbon Farming Solution: A Global Toolkit of Perennial Crops and Regenerative Agriculture Practices for Climate Change Mitigation and Food Security, by Eric Toensmeier and Dr. Hans Herren, 2016, 512 pages
Container Gardening, by Joy Louis, 2015
Cornucopia II: A Source Book of Edible Plants, by Stephen Facciola, Kampong Publications, 1870 Sunrise Dr. Vista, CA 92084 USA,1998, Paperback, 713 pages
Edible Leaves of the Tropics 3rd Ed., by Franklin Martin, Ruth Ruberte, and Laura Meitzner, ECHO 17391 Durrance Rd. N. Fort Myers, FL 33917 USA, 1998, Paperback, 198 pages
A Green History of the World: The Environment and the Collapse of Great Civilizations, by Clive Ponting, Penguin Books, NY, 1991, Paperback, 432 pages
The Greening of the Revolution: Cuba's Experiment With Organic Agriculture, by Peter Rosset (Editor), Medea Benjamin (Editor), 1995, Paperback, 85 pages, Out of Print
Growing Food in a Hotter Drier Land, by Gary Nabhan, 2013
Handbook of Legumes of World Economic Importance, by James A. Duke, 1981, Hardback, 345 pages
The Intelligent Gardener, by Steve Solomon, 2013
Methodologies for Screening Soil Improving Legumes, by Marianne Sarrantonio, Rodale Institute, 611 Siegfriedale Road Kutztown, PA 19530 USA, 1991, Paperback, 310 pages, Out of Print
Perennial Vegetables, by Eric Toensmeier, 2007
Pests of the Garden and Small Farm: A Grower's Guide to Using Less Pesticide, by Mary Louise Flint, University of California, Davis CA, 1999, Paperback, 276 pages
The Primary Source:Tropical Forests and Our Future, by Norman Myers, 1992, Paperback, 416 pages
Sustainable Agricultural Systems, by Clive A Edwards, Lal Rattan, et. al, Soil and Water Conservation Society, 7515 Northeast Ankeny Rd. Ankeny, Iowa 50021, 1990, Hardback, 696 pages
Teaming with Nutrients, by Jeff Lowenfels, 2014
Tools for Organic Farming, by George McRobie, Ed., Intermediate Technology Publications, London, 1990, Paperback, 77 pages
Tropical Forests and Their Crops, by Nigel J. Smith and J. T. Williams and et al, Cornell University Press, Ithaca NY, 1992, Paperback, 568 pages
Vegetable Production in the Tropics, by C.N Williams, J.O Uzo, and W.T.T. Peregrine, Longman Scientific and Technical Publishing, London, 1991, Paperback, 179 pages, Out of Print
Weed Control: Tropical Agriculturist Series, by E.M Lavabre, MacMillan Press, London, 1991, Paperback, 90 pages
World Vegetables: Principles, Production, and Nutritive Values; Second Ed. by Vincent E. Rubatzky and Mas Yamaguchi, Chapman and Hall Press, NY, 1997, Hardback, 843 pages
Year-Round Indoor Salad Garden, by Peter Burke, 2015
Appropriate Food Packaging, by Peter Fellows and Barry Axtell,
Transfer of Technology for Development Publishing, Amsterdam, Paperback, 135 pages, Out of Print
On Food and Cooking: The Science and Lore of the Kitchen, by Harold McGee, Collier Books, NY, 1984, Paperback, 684 pages
Small-Scale Food Processing: A Guide to Appropriate Equipment by Peter Fellows and Ann Hampton, Intermediate Technology Publications, London, 1992, Paperback, 158 pages, Out of Print
Manual on Feeding Infants and Young Children 3rd Ed. by Margaret Cameron and Yngve Hofvander, Oxford University Press, Toronto Ontario Canada, 1983, Paperback, 214 pages, Out of Print
Nutritional Care of the Older Adultby Annette B. Natow and Jo-Ann Heslin, MacMillan Press, NY, 1986, Paperback, 306 pages
Nutrition of the Elderly, by Munro and Schliere, Nestle Nutrition Service, Raven Press, NY,1991, Paperback, Out of Print
Primary Child Care:.A Manual for Health Care Workers: Book One and Two by Maurice King and Felicity King, Oxford Medical Publications, Toronto Ontario Canada, 1991, Paperback, 311 pages and 194 pages, Out of print
Toxic Constituents of Plant Foodstuffs: 2nd Ed, by Irvine E. Liener, Editor, Academic Press, NY, 1980, Hardback, 502 pages, Out of print
Tufts University Guide to Total Nutrition, by Stanley Gershoff, Harper Collins Publishers, NY, 1990, Paperback, 312 pages
Yale Guide to Children’s Nutrition edited, by William V. Tamborlane, Yale University Press, New Haven, CT, 1997, Paperback, 414 pages
Greens Glorious Greens, by Johna Albi and Catherine Wathers, St. Martin’s Press, NY, 1996, Paperback, 276 pages
366 Healthful Ways to Cook Leafy Greens, by Linda Romanelli Leahy, Penguin Books, NY, 1997, Paperback, 389 page
The Field Directors' Handbook: An Oxfam Manual for Development Workers by Jo Boyden and Brian Pratt, Oxford University Press, Toronto Ontario Canada, 1985, Hardback, 512 pages, Out of print
Helping Health Workers Learn, by David Werner and Bill Bower, The Hesperian Foundation, Palo Alto, CA, 1982, Paperback, c. 400 pages
Humanity Development Library v.2.0 by Humanity Libraries Project, Antwerp, BELGIUM, 1998 from ECHO, c. 160,000 pages from 1,230 publications
VITA Development Publications by Volunteers in Technical Assistance, Arlington, VA, USA, 1998, c. 150 VITA publications