APA (7th ed.) Citation

Simpson, R. D., & Christensen, N. L. (1997). Ecosystem function and human activities: Reconciling economics and ecology. Chapman and Hall.

Chicago Style (17th ed.) Citation

Simpson, Ralph David, and Norman L. Christensen. Ecosystem Function and Human Activities: Reconciling Economics and Ecology. New York: Chapman and Hall, 1997.

MLA (9th ed.) Citation

Simpson, Ralph David, and Norman L. Christensen. Ecosystem Function and Human Activities: Reconciling Economics and Ecology. Chapman and Hall, 1997.