Não informado. (1918). Journal of the College of Agriculture. Hokkaido Imperial University.
Chicago-referens (17:e uppl.)Não informado. Journal of the College of Agriculture. Sapporo, Japão: Hokkaido Imperial University, 1918.
MLA-referens (8:e uppl.)Não informado. Journal of the College of Agriculture. Hokkaido Imperial University, 1918.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.