Rolston, Holmes III (Spring 1998). "Technology versus nature: what is natural?"(PDF). Journal of Philosophy and Technology. 2 (2). University of Aberdeen Center for Philosophy, Technology & Society: 3–14. Archived from the original(PDF) on 29 October 2013. Retrieved 25 October 2013.
Rolston, Holmes III (Spring 1998). "Technology versus nature: what is natural?"(PDF). Journal of Philosophy and Technology. 2 (2). University of Aberdeen Center for Philosophy, Technology & Society: 3–14. Archived from the original(PDF) on 29 October 2013. Retrieved 25 October 2013.