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Ruckebusch Y,. (1975). The hypnogram as an index of adaptation of farm animals to changes in their environment. App Anim Ethol, 2, 3–18.
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RUCKEBUSCH Y et al,. (1970). Les états de sommeil chez le cheval. Soc.de Biologie de Toulouse, 658, 665.
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Ryder O,. (1983). The quagga is gone but its genes may survive. Zoonooz San Diego Zoo, 16.
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RYDER OA et al,. (1978). Chromosome banding studies of the equidae. Cytogent Cell Genet, 20, 323–350.
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Rzasnicki A,. (1933). Beobachtungen an Chapman – Zebras. Zool. Garten., 6, 1–10.
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Rzasnicki A,. (1934). Ein wildpferdfarbiges Shetlandponyfohlen. Zool. Garten., 7, 89–92.
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Rzasnicki A,. (1936). Zur Kenntnis und zur Entdeckungsgeschichte des Grevy – Zebras. Zool. Garten., 8, 283–291.
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Rzasnicki A,. (1939). Ein Maulesel im Warschauer Zoo. Zool. Garten., 10; 202, 207.
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Rzasnicki A Py,. (). Complete list of the specimens of skeletons and skins of Equus quagga quagga preseved in the museum of the whole world in 1939. Ann Mus Zool Polonica, 14, 69–73.
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Rzasnicki A,. (1951). Zebras and quaggas. Ann Mus Zool Polonica, 16, 203–252.
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