Ryder, O.A.; Chemnick, L.G. (1990). “Chromosomal and molecular evolution in Asiatic wild asses”. 《Genetica》 83 (1): 67–72. doi:10.1007/BF00774690. PMID2090563. S2CID12351710.지원되지 않는 변수 무시됨: |name-list-style= (도움말)
Crees, Jennifer J.; Turvey, Samuel T. (2014). “Holocene extinction dynamics of Equus hydruntinus, a late-surviving European megafaunal mammal”. 《Quaternary Science Reviews》 91: 16–29. Bibcode:2014QSRv...91...16C. doi:10.1016/j.quascirev.2014.03.003.
Crees, Jennifer J.; Turvey, Samuel T. (2014). “Holocene extinction dynamics of Equus hydruntinus, a late-surviving European megafaunal mammal”. 《Quaternary Science Reviews》 91: 16–29. Bibcode:2014QSRv...91...16C. doi:10.1016/j.quascirev.2014.03.003.