Cita APA (7th ed.)

Callicott, J. B., & Frodeman, R. (2009). Encyclopedia of Environmental Ethics and Philosophy. Macmillan Reference USA / Gale.

Cita Chicago (17th ed.)

Callicott, J. Baird, i Robert Frodeman. Encyclopedia of Environmental Ethics and Philosophy. Detroit: Macmillan Reference USA / Gale, 2009.

Cita MLA (9th ed.)

Callicott, J. Baird, i Robert Frodeman. Encyclopedia of Environmental Ethics and Philosophy. Macmillan Reference USA / Gale, 2009.