APA aipamena

Knowler, F., & Watkin, J. (1960). Practical Course in Agricultural Chemistry (2.). Macmillan and Company Ltd.

Chicago Style aipamena

Knowler, Frank, and J.Elphin Watkin. Practical Course in Agricultural Chemistry. 2. London: Macmillan and Company Ltd, 1960.

MLA aipamena

Knowler, Frank, and J.Elphin Watkin. Practical Course in Agricultural Chemistry. 2. Macmillan and Company Ltd, 1960.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.