Não informado. (1963). Half-yearly progress report. Cocoa Research Institute of Ghana.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Half-yearly Progress Report. Tafo, Gana: Cocoa Research Institute of Ghana, 1963.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Half-yearly Progress Report. Cocoa Research Institute of Ghana, 1963.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.