Kumar Sanjeev. (2021). Prelims General Studies UPSC/PCS. Lucent Publication.
Cita Chicago (17th ed.)Kumar Sanjeev. Prelims General Studies UPSC/PCS. Patna: Lucent Publication, 2021.
Cita MLA (9th ed.)Kumar Sanjeev. Prelims General Studies UPSC/PCS. Lucent Publication, 2021.
Atenció: Aquestes cites poden no estar 100% correctes.