Cita APA (7th ed.)

Foin, T. C. J. (1976). Ecological systems and the environment. Houghton Mifflin.

Cita Chicago (17th ed.)

Foin, Theodore C. Jr. Ecological Systems and the Environment. Boston: Houghton Mifflin, 1976.

Cita MLA (9th ed.)

Foin, Theodore C. Jr. Ecological Systems and the Environment. Houghton Mifflin, 1976.