 | Thomas, O., 1929. On mammals from the Kaoko-Veld, South-West Africa, obtained during Captain Shortridge's fifth Percy Sladen and Kaffrarian Museum expedition. Proceedings of the Zoological Society of London 1929 (1): 99-111
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 | Thomas, O., 1911. The mammals of the tenth edition of Linnaeus; an attempt to fix the types of the genera and the exact bases and localities of the species. Proceedings of the Zoological Society of London 1911: 120-145
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 | Thomas, O., 1906. Mammals. In: The history of the collections contained in the natural history departments of the British Museum. London, vol. 2, pp. 1-110
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 | Thomas, O., 1901. Notes on the type specimen of Rhinoceros lasiotis Sclater, with remarks on the generic position of the living species of rhinoceros. Proceedings of the Zoological Society of London 1901 June 4: 154-158
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 | Thomas, O., 1900. The white rhinoceros on the upper Nile. Nature 62 (1616), October 18, 1900: 599
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 | Thomas, O., 1896. On the mammals of Nyasaland: fourth notice. Proceedings of the Zoological Society of London 1896 November. 17: 788-791
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 | Thomas, O., 1895. An analysis of the mammalian generic names given in Dr C.W.L. Gloger's Naturgeschichte (1841). Annals and Magazine of Natural History (6) 15: 189-193
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 | Thomas, O., 1892. On the probable identity of certain specimens, formerly in the Lidt de Jeude Collection, and now in the British Museum. Proceedings of the Zoological Society of London 1892: 309-317
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 | Thomas, O., 1886. List of mammals obtained and observed on Mount Kilima-Njaro and its vicinity: pp. 387-394
| In: Johnston, H.H. The Kilima-Njaro expedition: a record of scientific exploration in Eastern Equatorial Africa, and a general fescription of the natural history, languages, and commerce of the Kilima-Njaro district. London, Kegan Paul, Trench and Co: pp. i-xv, 1-572 |
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 | Thomas, O., 1885. Report on the mammals obtained and observed by Mr HH Johnston on Mount Kilima-njaro. Proceedings of the Zoological Society of London 1885 March 3: 219-221
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