1John O'Neill, The Varieties of Intrinsic Value, Andrew Light and Holmes Rolston Ⅲ , Environmental Ethics, Blackwell Publishing, 2003, p. 131.
2Katie McShane, Why Environmental Ethics Shouldn' t Give Up on Intrinsic Value, Environmental Ethics, 29( 2007 ) , pp. 43 - 44, p. 45, pp. 45 -46.
3Oliver A. Johnson and Andrews Reath, Ethics: Selections from Classical and Contemporary Writers, Thomson Wadsworth, 2007, p. 183 ,p. 183 ,p. 18d,p. 184,p. 186, pp. 187 - 188 ,pp. 184 - 185 ,p. 200, p. 199,p. 184,p. 191 ,p. 185, p. 200,p. 199,p. 200,p. 200.
4Allen W. Wood, Kant's Ethical Thought, Cambridge University Press, 1999 ,p. 115.
5Holmes Rolston, Ⅲ, Environmental Ethics, Published by Temple University Press, 1988, On the cover.
6Holmes Rolston, Ⅲ, Value in Nature and the Nature of Value, Andrew Light and Holmes Rolston, Ⅲ, Environmental Ethics, Blackwell Publishing, 2003, p. 150,p. 143,p. 144,p. 144,p. 144,p. 145,p. 144,p. 145,p. 146,p. 145,p. 146,p. 147,p. 147,pp. 147 - 148,p. 149,p. 149,p. 152,p. 150,p. 151 ,p. 150,p. 152,p. 151 ,p. 146.
