APA (7th ed.) Citation

Clements, F. E., & Shear, C. L. (1931). The genera of fungi. Hafner.

Chicago Style (17th ed.) Citation

Clements, Frederic E., and Cornelius L. Shear. The Genera of Fungi. New York, USA: Hafner, 1931.

MLA (9th ed.) Citation

Clements, Frederic E., and Cornelius L. Shear. The Genera of Fungi. Hafner, 1931.