Tropical Root and Tuber Crops—Stephen K. O'Hair
Root Vegetables: New Uses for Old Crops—Wanda W. Collins
Magness—J.R., G.M. Markle, C.C. Compton. 1971. Food and feed crops of the United States.
Outside Links:
Yam—FAO/IPGRI Technical Guidelines for the Safe Movement of Yam Germplasm—Link to the publication on the International Plant Genetic Resources Institute web site
Yam—Descriptors for Yam—Link to the publication on the International Plant Genetic Resources Institute web site