Cita APA (7a ed.)

Pratt, R., & Youngken, H. W. 1. (1956). Pharmacognosy. Teh study of natural drug substances and certain allierd products. J. B. Lippincott.

Cita Chicago Style (17a ed.)

Pratt, Robertson, y Heber Wilkinson 1913 Youngken. Pharmacognosy. Teh Study of Natural Drug Substances and Certain Allierd Products. Philadelphia: J. B. Lippincott, 1956.

Cita MLA (9a ed.)

Pratt, Robertson, y Heber Wilkinson 1913 Youngken. Pharmacognosy. Teh Study of Natural Drug Substances and Certain Allierd Products. J. B. Lippincott, 1956.