APA-referens

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

Chicago-stil citat

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

MLA-referens

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