Cita APA (7th ed.)

Freeland, P. (1991). Habitats and the enviornment. Hedder&Stoughton.

Cita Chicago (17th ed.)

Freeland, Peter. Habitats and the Enviornment. London: Hedder&Stoughton, 1991.

Cita MLA (9th ed.)

Freeland, Peter. Habitats and the Enviornment. Hedder&Stoughton, 1991.

Atenció: Aquestes cites poden no estar 100% correctes.