APA (7th ed.) Citation

Devall, B., & Sessions, G. (1985). Deep ecology. G.M. Smith.

Chicago Style (17th ed.) Citation

Devall, Bill, and George Sessions. Deep Ecology. Salt Lake City, Utah: G.M. Smith, 1985.

MLA (9th ed.) Citation

Devall, Bill, and George Sessions. Deep Ecology. G.M. Smith, 1985.