Não informado. (1959). World agricultural economics and rural sociology abstracts. Commonwealth Agricultural Bureau.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. World Agricultural Economics and Rural Sociology Abstracts. Farnham Royal, Inglaterra: Commonwealth Agricultural Bureau, 1959.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. World Agricultural Economics and Rural Sociology Abstracts. Commonwealth Agricultural Bureau, 1959.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.