surender singh and Virender parmar. (2018). General Studies for the Civil Service Preliminary Examination: GS paper 1 (01 Edition.).
Chicago Edition Citationsurender singh and Virender parmar. General Studies for the Civil Service Preliminary Examination: GS Paper 1. 01 Edition. Mcgraw Hill Education, Chennai, 2018.
MLA Edition Citationsurender singh and Virender parmar. General Studies for the Civil Service Preliminary Examination: GS Paper 1. 01 Edition. 2018.
Warning: These citations may not always be 100% accurate.