*[http://www.merckvetmanual.com/mvm/index.jsp?cfile=htm/bc/50713.htm The Merck Veterinary Manual: Enterotoxemia Caused by Clostridium perfringens Types B and C]
+
*[http://www.merckvetmanual.com/mvm/index.jsp?cfile=htm/bc/50713.htm The Merck Veterinary Manual: Enterotoxemia Caused by ''Clostridium perfringens'' Types B and C]
−
*[http://www.ivis.org/advances/Disease_Factsheets/epsilon_toxin_clostridium.pdf The Center for Food Security and Public Health Animal Disease Factsheet: Epsilon toxin of Clostridium perfringens.]
+
*[http://www.ivis.org/advances/Disease_Factsheets/epsilon_toxin_clostridium.pdf The Center for Food Security and Public Health Animal Disease Factsheet: Epsilon toxin of ''Clostridium perfringens''.]
*[http://www.noah.co.uk/issues/briefingdoc/22-vaccfarmanimals.htm NOAH: Vaccination of farm animals]
*[http://www.noah.co.uk/issues/briefingdoc/22-vaccfarmanimals.htm NOAH: Vaccination of farm animals]