Singh, S. (2010). Geography: For the UPSC Civil Services preliminary examination (3rd ed.). TMH.
Chicago-tyylinen lähdeviittausSingh, Surender. Geography: For the UPSC Civil Services Preliminary Examination. 3rd ed. New Delhi: TMH, 2010.
MLA-viiteSingh, Surender. Geography: For the UPSC Civil Services Preliminary Examination. 3rd ed. TMH, 2010.
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