1. Albanese, Anthony A. 1959. Protein and amino acid nutrition. Academic Press, New York.
2. Altschul, Aaron M. 1962. Seed proteins and world food problems. Econ Bot.16: 2–13.
3. Block, Richard J., and Kathryn W. Weiss. 1956. Amino acid handbook. Charles C. Thomas, Springfield, Illinois.
4. Brooks, R. H., L. Kaplan, H. C. Cutler, and T. W. Whitaker. 1962. Plant material from a cave on the Rio Zape, Durango, Mexico. Am. Antiquity27: 356–369.
5. Bukasov, S. M. 1930. Cultivated plants of Mexico, Guatemala, and Colombia. Bull. Appl. Bot. Gen. and Plant. Breeding Suppl.47: 151–176. Leningrad. [Mss. translation by H. J. Kidd.]