Não informado. (1918). Journal of the College of Agriculture. Hokkaido Imperial University.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Journal of the College of Agriculture. Sapporo, Japão: Hokkaido Imperial University, 1918.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Journal of the College of Agriculture. Hokkaido Imperial University, 1918.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.