APA (7th ed.) Citation

Youngken, H. W. (1921). A text book of pharmacognosy. P. Blakiston's son & co.

Chicago Style (17th ed.) Citation

Youngken, Heber Wilkinson. A Text Book of Pharmacognosy. Philadelphia: P. Blakiston's son & co, 1921.

MLA (8th ed.) Citation

Youngken, Heber Wilkinson. A Text Book of Pharmacognosy. P. Blakiston's son & co, 1921.