Singh, A. K. (2008). Science and technology for civil services examinations. Tata Mc-Graw Hill.
استشهاد بنمط شيكاغوSingh, Ashok Kumar. Science and Technology for Civil Services Examinations. New Delhi: Tata Mc-Graw Hill, 2008.
MLA استشهادSingh, Ashok Kumar. Science and Technology for Civil Services Examinations. Tata Mc-Graw Hill, 2008.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.