Não informado. (1962). Half-yearly progress report. West African Cocoa Research Institute.
Chicago-Zitierstil (17. Ausg.)Não informado. Half-yearly Progress Report. Tafo, Gana: West African Cocoa Research Institute, 1962.
MLA-Zitierstil (8. Ausg.)Não informado. Half-yearly Progress Report. West African Cocoa Research Institute, 1962.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.