Singh, S. (2010). Geography: For the UPSC Civil Services preliminary examination (3rd ed.). TMH.
Dyfyniad Arddull ChicagoSingh, Surender. Geography: For the UPSC Civil Services Preliminary Examination. 3rd ed. New Delhi: TMH, 2010.
Dyfyniad MLASingh, Surender. Geography: For the UPSC Civil Services Preliminary Examination. 3rd ed. TMH, 2010.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.