* [http://www.pv.wageningen-ur.nl/english/ Research Institute for Animal Husbandry]
* [http://www.ighz.edu.pl/?p0=1&l=2 Institute of Genetics and Animal Breeding PAS]
* [http://www.fao.org Food and Agriculture Organization of the United Nations (FAO)]
* [http://www.fao.org/docrep/004/T0559E/T0559E00.htm#TOC ''In situ conservation of livestock and poultry'', १९९२, Online book, Food and Agriculture Organization of the United Nations and the United Nations Environment Programme]
* [http://www.grandin.com/ Dr. Temple Grandin's Web Page] Livestock Behaviour, Design of Facilities and Humane Slaughter