Coba jelasin Lihat pula dari Koka dong

Brasileira de Psiquiatria 28(4): 277 -->

Turner C. E., Elsohly M. A., Hanuš L., Elsohly H. N. Isolation of dihydrocuscohygrine from Peruvian coca leaves. Phytochemistry 20 (6), 1403-1405 (1981)

"History of Coca. The Divine Plant of the Incas" by W. Golden Mortimer, M.D. 576 pp. And/Or Press San Francisco, 1974. This title has no ISBN.

Coca Yes, Cocaine No? Legal Options for the Coca Leaf Transnational Institute (TNI), Drugs & Conflict Debate Paper 13, May 2006

Coca leaf news page – Alcohol and Drugs History Society