^S.L. Davis (2001). "The least harm principle suggests that humans should eat beef, lamb, dairy, not a vegan diet". Proceedings of the Third Congress of the European Society for Agricultural and Food Ethics. pp. 449–450.
^S.L. Davis (2001). "The least harm principle suggests that humans should eat beef, lamb, dairy, not a vegan diet". Proceedings of the Third Congress of the European Society for Agricultural and Food Ethics. pp. 449-450.
^Case Study — Landfill Power Generation, H. Scott Matthews, Green Design Initiative, Carnegie Mellon University. “アーカイブされたコピー”. 2008年12月3日時点のオリジナルよりアーカイブ。2009年2月9日閲覧。 Retrieved 07.02.09
"Grow Up" Pullquote: "If designer Gordon Graff gets his way, a new skyscraper in Toronto's Theatre District could be the unlikely source of food for 35,000 residents."