1. Kugler W, Grunenfelder HP, Broxham E. Donkey breeds in Europe. Monitoring Institute for Rare Breeds and Seeds in Europe, Report 2007–2008.
2. Wu C. Status of Chinese donkey industry. Proceedings of 1st International Symposium on Donkey Science. Dong'E, Shandong, P.R. China. August 14th–17th, 2017.
3. Pugh DG. Donkey reproduction. Proceedings of the Annual Convention of the AAEP 2002; 113–114.
4. Reproductive biology of the mare;Ginther,1992
5. Tibary A, Sghiri A, Bakkoury M, Fite C. Reproductive patterns in donkeys. Proceedings of the 9th International Congress of World Equine Veterinary Association. Reprinted in IVIS with the permission of the Conference Organizers. http://www.ivis.org.