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.
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