APA (7e ed.) Bronvermelding

Edited by Clifford, N. J. (2009). Key Concepts in Geography (2nd ed.). Sage.

Chicago (17e ed.) Bronvermelding

Edited by Clifford, Nicholas J. Key Concepts in Geography. 2nd ed. Chennai: Sage, 2009.

MLA (9e ed.) Bronvermelding

Edited by Clifford, Nicholas J. Key Concepts in Geography. 2nd ed. Sage, 2009.