एपीए उद्धरण

Singh,Ashok Kumar. (2008). Science & Technology for civil services Examinations. Tata McGraw-Hill.

शिकागो स्टाइल उद्धरण

Singh,Ashok Kumar. Science & Technology for Civil Services Examinations. New Delhi: Tata McGraw-Hill, 2008.

एमएलए उद्धरण

Singh,Ashok Kumar. Science & Technology for Civil Services Examinations. Tata McGraw-Hill, 2008.