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Groves, C. P.; Bell, C. H. (2004). "New investigations on the taxonomy of the zebras genus Equus, subgenus Hippotigris". Mammalian Biology. 69 (3): 182–196. Bibcode:2004MamBi..69..182G. doi:10.1078/1616-5047-00133.
Badam, G. L.; Tewari, B. S. (1974). "On the zebrine affinities of the Pleistocene horse Equus sivalensis, falconer and cautley". Bulletin of the Deccan College Post-Graduate and Research Institute. 34 (1/4): 7–11. JSTOR42931011.
Azzaroli, A.; Stanyon, R. (1991). "Specific identity and taxonomic position of the extinct Quagga". Rendiconti Lincei. 2 (4): 425. doi:10.1007/BF03001000. S2CID87344101.
Wells, John (1997). "Our Changing Pronunciation". Transactions of the Yorkshire Dialect Society. XIX: 42–48. Archived from the original on 7 October 2014. Retrieved 6 February 2014.
Wells, John (1997). "Our Changing Pronunciation". Transactions of the Yorkshire Dialect Society. XIX: 42–48. Archived from the original on 7 October 2014. Retrieved 6 February 2014.