| Milton, O., 1964. The orang-utan and rhinoceros in North Sumatra. Oryx 7 (4): 177-184, pls. 5-8, map 1
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| Milton, O., 1964. The orang-utan and rhinoceros in Sumatra from two preliminary reports. Malayan Nature Journal 18 (1): 60-62, map 1
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| Milton, O., 1963. Report on survey of the Sumatran rhinoceros in Mid-Sumatra. Report to WWF, pp. 1-7, map 1
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| Milton, O.; Estes, R.D., 1963. Burma wildlife survey 1959-1960. Publications of the American Committee of International Wildlife Protection 15: i-iv, 1-72
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| Milton, O., 1963. Report on survey of the orang-utan and rhinoceros in North Sumatra and Atjeh - January to March 1963 (World Wildlife Fund Project no 35). Report to WWF, pp. 1-14, map 1
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| Milton, O., 1963. Report on survey of the orang-utan and rhinoceros in North Sumatra and Atjeh - May to June 1963 (World Wildlife Fund Project no 35). Report to WWF, pp. 1-5, map 1
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| Milton, O., 1963. Field notes on wildlife conservation in Malaya: a report prepared for the International Union for Conservation of Nature and Natural Resources and the American Committee for International Wild Life Protection. New York, American Committee for International Wild Life Protection, pp. 1-28
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| Milton, O., 1961. The Schwe-u-Daung, a rhinoceros sanctuary in Burma: pp. 103-106
| In: Wyatt-Smith, J. et al. Nature conservation in western Malaysia, 1961. Special issue of the Malayan Nature Journal.. Kuala Lumpur, Malayan Nature Society: pp. i-viii, 1-260 |
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