Are these books enough to prepare for civil services or I have to refer more books

Dear Suraj,For civil services, you need to have good knowledge regarding social studies. If you want more refernce books, you can go through the following:India’s Struggle For Independence – Bipan Chandra. (History)India’s Ancient Past – R.S. Sharma. (History)The Wonder That Was India – A.L. Bhasham. (Culture)Oxford School Atlas – Oxford. (Geography)Certificate Physical and Human Geography – Goh Cheng Leong. (Geography)Indian Economy – Ramesh Singh. (Economy)Economic Survey. (Economy)Science and Technology in India – TMH. (Science and Technology)Environmental Studies: From Crisis to Cure – Rajagopalan. (Environment)Environment for Civil Services Prelims and Mains – Khuller. (Environment)India Year Book (Current Affairs)Manorama Yearbook. (Current Affairs)ClearIAS Current Affairs Capsule [Monthly MCQs] (Current Affairs)CSAT Paper – 2 Manual by MHE or CSAT-II by Arihant (CSAT – Paper 2)Analytical Reasoning – M. K. Pandey (CSAT – Paper 2: Analytical Reasoning)Verbal & Non-Verbal Reasoning – R. S.Aggarwal (CSAT Paper 2: Reasoning)Hope it helps.Good Luck.