Não informado. (1962). Half-yearly progress report. West African Cocoa Research Institute.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Half-yearly Progress Report. Tafo, Gana: West African Cocoa Research Institute, 1962.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Half-yearly Progress Report. West African Cocoa Research Institute, 1962.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.