APA aipamena

Peter Freeland. (1991). Focus on biology: Habitats and the environment,investigation. London: Hodder and Stoughton.

Chicago Style aipamena

Peter Freeland. Focus On Biology: Habitats and the Environment,investigation. London: Hodder and Stoughton, 1991.

MLA aipamena

Peter Freeland. Focus On Biology: Habitats and the Environment,investigation. London: Hodder and Stoughton, 1991.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.