APA aipamena

Roberts, I. P. (1911). Fertility of the Land (12.). Macmillan Company.

Chicago Style aipamena

Roberts, Issac Phillip. Fertility of the Land. 12. New York: Macmillan Company, 1911.

MLA aipamena

Roberts, Issac Phillip. Fertility of the Land. 12. Macmillan Company, 1911.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.