Gaya APA

TOXOPEUS, H., Hutomo, T. (1975). Bulk cocoa in Indonesia and the production of improved planting material . Medan: Food and agriculture organization.

Gaya MLA

TOXOPEUS, Hille., Hutomo, TRI. "Bulk cocoa in Indonesia and the production of improved planting material". Medan: Food and agriculture organization, 1975. Buku.