APA-referens (7:e uppl.)

Kuan, L. G. (1986). Herbal medicine and drug substitution: Perceptions and attitudes of PGH health workers. University of the Philippines.

Chicago-referens (17:e uppl.)

Kuan, Letty G. Herbal Medicine and Drug Substitution: Perceptions and Attitudes of PGH Health Workers. Manila: University of the Philippines, 1986.

MLA-referens (9:e uppl.)

Kuan, Letty G. Herbal Medicine and Drug Substitution: Perceptions and Attitudes of PGH Health Workers. University of the Philippines, 1986.