Citazione Stile APA (7a Edizione)

Singh, S. &. P. (2019). General studies for civil services preliminary examination 2019. McGraw Hill.

Citazione stile Chigago Style (17a edizione)

Singh, Surendra & Parmar. General Studies for Civil Services Preliminary Examination 2019. Chennai: McGraw Hill, 2019.

Citatione MLA (9a ed.)

Singh, Surendra & Parmar. General Studies for Civil Services Preliminary Examination 2019. McGraw Hill, 2019.