1. Bolau, H., 1877. Über den Orang-utan des Zoologischen Gartens in Hamburg.Verh. Naturwiss. Ver. Hamburg-Altona, N.F. 1: 119–121. (cited fromSchultz, 1956)
2. Delahunt, C.S., 1966. Rubella induced cataracts in monkeys.Lancet, 7441: 825. (cited fromWilson, 1966)
3. Furuya, Y., 1966. On the malformation occurred in the Gagyusan troop of wild Japanese monkeys.Primates, 7(4): 488–492.
4. Hayashi, I., 1960. Malformations. In:Text-book of General Pathology,K. Suzue &T. Kobayashi (eds.) Igaku-shoin, Tokyo, pp. 700–776. (in Japanese)
5. Hazama, N., 1964. Weighing wild Japanese monkeys in Arashiyama.Primates, 5(3–4): 81–104.