Edited by Clifford, N. J. (2009). Key Concepts in Geography (2nd ed.). Sage.
Tohutoru Kātū Chicago (17th ed.)Edited by Clifford, Nicholas J. Key Concepts in Geography. 2nd ed. Chennai: Sage, 2009.
Tohutoro MLA (9th ed.)Edited by Clifford, Nicholas J. Key Concepts in Geography. 2nd ed. Sage, 2009.
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