Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.