Sources list for OPUS NATURAL:

Keenan, J. F. "The Idea of Natural Rights: Studies on Natural Rights, Natural Law, and Church Law, 1150-1625." Theological Studies 59.4 (1998): 729.
Human Rights

"Naturalism." Naturalism. Fromdeathtolife.com. 9 Feb. 2005 <http://fromdeathtolife.org/cphil/natural.html>.
Naturalism and Idealism

Woodlief, Anne. "Emerson-Nature." Emerson-Nature. 2002. American Transcendentalism Web. 20 Apr. 2006 . Woodlief, Anne. "Emerson-Nature." Emerson-Nature. 2002. American Transcendentalism Web. 20 Apr. 2006 <http://www.vcu.edu/engweb/transcende ntalism/authors/emerson/nature.html>.
"Nature" and "Walden" Compared

Lenton, Timothy M. "Gaia and Natural Selection." Nature 394 (1998): 439-447.
The Gaia Hypothesis

National Park Service. How Does Natural Regulation Work? The Official Website of Yellowstone National Park. http://www.nps.gov/yell/nature/n orthernrange/natreg/natural.html National Park Service. How Does Natural Regulation Work? The Official Website of Yellowstone National Park. http://www.nps.gov/yell/nature/n orthernrange/natreg/natural.html
Conservation and Preservation

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