Vashist, A. K. (2012). One thousand plus questions on general science: General studies for civil services preliminary examinations - paper I. Tata Mc Graw Hill Education.
শিকাগো স্টাইলে সাইটেশনVashist, Ashish Kumar. One Thousand Plus Questions on General Science: General Studies for Civil Services Preliminary Examinations - Paper I. New Delhi: Tata Mc Graw Hill Education, 2012.
এমএলএ সাইটেশনVashist, Ashish Kumar. One Thousand Plus Questions on General Science: General Studies for Civil Services Preliminary Examinations - Paper I. Tata Mc Graw Hill Education, 2012.
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