एपीए उद्धरण

Singh, A. K. (2008). Science and technology for civil services examinations. Tata Mc-Graw Hill.

शिकागो स्टाइल उद्धरण

Singh, Ashok Kumar. Science and Technology for Civil Services Examinations. New Delhi: Tata Mc-Graw Hill, 2008.

एमएलए उद्धरण

Singh, Ashok Kumar. Science and Technology for Civil Services Examinations. Tata Mc-Graw Hill, 2008.