Cita APA (7a ed.)

Pepper, D. (1997). Modern environmentalism: An introduction. Routledge.

Cita Chicago Style (17a ed.)

Pepper, David. Modern Environmentalism: An Introduction. --New York: Routledge, 1997.

Cita MLA (9a ed.)

Pepper, David. Modern Environmentalism: An Introduction. Routledge, 1997.