PNG Cocoa & Coconut Research Institute, Cocoa Quality Improvement Project (Papua New Guinea), & PNG Cocoa and Coconut Research Institute. (1990). Information bulletins (Cocoa). PNG Cocoa & Coconut Research Institue.
Chicago-referens (17:e uppl.)PNG Cocoa & Coconut Research Institute, Cocoa Quality Improvement Project (Papua New Guinea), och PNG Cocoa and Coconut Research Institute. Information Bulletins (Cocoa). Kerevat: PNG Cocoa & Coconut Research Institue, 1990.
MLA-referens (9:e uppl.)PNG Cocoa & Coconut Research Institute, et al. Information Bulletins (Cocoa). PNG Cocoa & Coconut Research Institue, 1990.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.