APA aipamena

Hartley, C. W. S. (1977). Oil palm (2nd. ed.). Longman.

Chicago Style aipamena

Hartley, C. W. S. Oil Palm. 2nd. ed. London: Longman, 1977.

MLA aipamena

Hartley, C. W. S. Oil Palm. 2nd. ed. Longman, 1977.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.