Jelasin soal Koka  dalam bahasa sunda dong

Koka ngawengku opat pepelakan ti family Erythroxylaceae, pituin Amérika Kidul beulah kulon. Koka katelah ku kandungan alkaloid psikoaktip: kokain.

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.