Clifford, N. J. (2009). Key concepts in geography (2nd ed.). Ssge.
Citación estilo ChicagoClifford, Nicholas J,Ed. Key Concepts in Geography. 2nd ed. Los Angeles: Ssge, 2009.
Cita MLAClifford, Nicholas J,Ed. Key Concepts in Geography. 2nd ed. Ssge, 2009.
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