Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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