एपीए उद्धरण

Singh, A. K. (2013). Science & Technology for civil services examinations. Tata Mc Graw Hill.

शिकागो स्टाइल उद्धरण

Singh, Ashok Kumar. Science & Technology for Civil Services Examinations. New Delhi: Tata Mc Graw Hill, 2013.

एमएलए उद्धरण

Singh, Ashok Kumar. Science & Technology for Civil Services Examinations. Tata Mc Graw Hill, 2013.