Callicott, J. B., & Frodeman, R. (2009). Encyclopedia of environmental ethics and philosophy. Macmillan Reference USA/Gale Cengage Learning.
Chicago-čujuhus (17. p.)Callicott, J. Baird, juo Robert Frodeman. Encyclopedia of Environmental Ethics and Philosophy. Farmington Hills, MI: Macmillan Reference USA/Gale Cengage Learning, 2009.
MLA-čujuhus (9. p.)Callicott, J. Baird, juo Robert Frodeman. Encyclopedia of Environmental Ethics and Philosophy. Macmillan Reference USA/Gale Cengage Learning, 2009.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.
