APA (7th ed.) Citation

Gathercoal, E. N., Wirth, E. H., & Kraemer, H. (1936). Pharmacognosy. Lea & Febiger.

Chicago Style (17th ed.) Citation

Gathercoal, Edmund Norris, Elmer Hauser Wirth, and Henry Kraemer. Pharmacognosy. Philadelphia: Lea & Febiger, 1936.

MLA (8th ed.) Citation

Gathercoal, Edmund Norris, et al. Pharmacognosy. Lea & Febiger, 1936.