APA citiranje

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

Trích dẫn kiểu Chicago

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

MLA citiranje

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

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