Cita APA

Tyler, V. E., By, B. ., & Robbers , J. E. (1981). Pharmacognosy (8th ed.). Lea & Febiger.

Citación estilo Chicago

Tyler, Varro E., Brady By, and James E. Robbers. Pharmacognosy. 8th ed. Philadelphia: Lea & Febiger, 1981.

Cita MLA

Tyler, Varro E., et al. Pharmacognosy. 8th ed. Lea & Febiger, 1981.