found: Mammal species of the world, 1993:p. 370 (Equus quagga)
found: Corbet, G.B. A world list of mammalian species, 1991:p. 123 (Equus quagga, Quagga, extinct)
found: Walker mamm. world:v. 2, p. 1304 (Equus quagga, Quagga)
found: Web. 3(quagga, Equus quagga)
found: Britannica online, Dec. 31, 2020(under Zebra: the plains zebra (Equus quagga); made up of six subspecies: E. quagga crawshaii (Crawshay's zebra), E. quagga borensis (half-maned zebra), E. quagga boehmi (Grant's zebra), E. quagga chapmani (Chapman's zebra), E. quagga burchellii (Burchell's zebra), and E. quagga quagga (quagga, which is extinct))
found: ITIS, Dec. 31, 2020(Equus quagga quagga. Taxonomic rank: subspecies. Common name: Quagga. Species: Equus quagga - Plains Zebra, Quagga)