1. Bukasov, S. M. 1930. The cultivated plants of Mexico, Guatemala and Colombia. Leningrad. 553 p.
2. Cobo, B. 1956. Historia del Nuevo Mundo. Biblioteca de Autores Españoles. Vol. 81. Madrid. 430 p.
3. Cook, O. F. 1925. Peru as a center of domestication. Journ. Hered.16: 33–46, 95-110.
4. Chacón, R. C. 1961. Estudio fitoquímico deLepidinm meyenii Walp. Thesis, Univ. Nac. Mayor de San Marcos, Lima, Perú. 43 p.
5. Hawkes, J. G. 1947. On the origin and meaning of South America potato names. Journ. Linn. Soc. (Bot.)53: 350–205-250.