APA (7th ed.) Citation

Gemmill, C. L. (1966). Silphium. Johns Hopkins University Press.

Chicago Style (17th ed.) Citation

Gemmill, Chalmers L. Silphium. Baltimore, Md: Johns Hopkins University Press, 1966.

MLA (9th ed.) Citation

Gemmill, Chalmers L. Silphium. Johns Hopkins University Press, 1966.