Cita APA (7a ed.)

Gilliam, H., & Bry, M. (1967). The natural world of San Francisco. Doubleday.

Cita Chicago Style (17a ed.)

Gilliam, Harold, y Michael Bry. The Natural World of San Francisco. Garden City, N.Y.: Doubleday, 1967.

Cita MLA (8a ed.)

Gilliam, Harold, y Michael Bry. The Natural World of San Francisco. Doubleday, 1967.