Crosby, Donald A. “J. Baird Callicott, Thinking Like a Planet: The Land Ethic and the Earth Ethic”. Journal for the Study of Religion, Nature and Culture 12, no. 2 (October 2, 2018): 243–246. Accessed April 30, 2025. https://journal.equinoxpub.com/JSRNC/article/view/3993.