Conlee KM, Stephens ML, Rowan AN, King LA. Carbon dioxide for euthanasia: concerns regarding pain and distress, with special reference to mice and rats. Lab. Anim. April 2005, 39 (2): 137–61. PMID 15901358. doi:10.1258/0023677053739747.
Becker, Geoffrey S. Animal Rendering: Economics and Policy(PDF). The National Agricultural Law Centre: Congressional Research Service Reports. 17 March 2004 [9 June 2010]. (原始内容存档(PDF)于2018-02-17).
Conlee KM, Stephens ML, Rowan AN, King LA. Carbon dioxide for euthanasia: concerns regarding pain and distress, with special reference to mice and rats. Lab. Anim. April 2005, 39 (2): 137–61. PMID 15901358. doi:10.1258/0023677053739747.
Becker, Geoffrey S. Animal Rendering: Economics and Policy(PDF). The National Agricultural Law Centre: Congressional Research Service Reports. 17 March 2004 [9 June 2010]. (原始内容存档(PDF)于2018-02-17).