Kumar Vashist Ashish & Singh Ramesh. (2012). 1000 Plus Questions on General Science General Studies: For Civil Services Preliminary Examination Paper-1. New Delhi.
শিকাগো স্টাইলে সাইটেশনKumar Vashist Ashish এবং Singh Ramesh. 1000 Plus Questions on General Science General Studies: For Civil Services Preliminary Examination Paper-1. New Delhi, 2012.
এমএলএ সাইটেশনKumar Vashist Ashish এবং Singh Ramesh. 1000 Plus Questions on General Science General Studies: For Civil Services Preliminary Examination Paper-1. New Delhi, 2012.
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