Cita APA (7a ed.)

Walcott, C. D. (1898). Fossil Medusae. Govt. print. off.

Cita Chicago Style (17a ed.)

Walcott, Charles D. Fossil Medusae. [Washington: Govt. print. off, 1898.

Cita MLA (9a ed.)

Walcott, Charles D. Fossil Medusae. Govt. print. off, 1898.