Singh, A. K. (2008). Science and Technology for civil sevices examinations. Tata Mcgraw Hill.
Chicago Stili AlıntıSingh, Ashok Kumar. Science and Technology for Civil Sevices Examinations. New Delhi: Tata Mcgraw Hill, 2008.
MLA AlıntıSingh, Ashok Kumar. Science and Technology for Civil Sevices Examinations. Tata Mcgraw Hill, 2008.
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