APA引文

Hargrove, E. C. (1989). Foundations of environmental ethics. Prentice-Hall.

Chicago Style (17th ed.) Citation

Hargrove, Eugene C. Foundations of Environmental Ethics. Englewood Cliffs, NJ: Prentice-Hall, 1989.

MLA引文

Hargrove, Eugene C. Foundations of Environmental Ethics. Prentice-Hall, 1989.