[Nihon Daigaku, Jinkō Kenkyūjo; Hokkaidō Daigaku] (1981). Planned population distribution for development: Hokkaido experience (Conference papers: report of the UNFPA/NUPRI International Seminar on Planned Population Distribution for Development: Hokkaido Experience, 19–23 May 1980, Sapporo, Japan, sponsored by the United Nations Fund for Population Activities, in collaboration with the Nihon University Population Research Institute and Hokkaido University). New York: United Nations Fund for Population Activities. p. 37. Accessed October 2014.
fao.org
dad.fao.org
Breed data sheet: Dosanko/Japan. Domestic Animal Diversity Information System of the Food and Agriculture Organization of the United Nations. Accessed October 2014.