APA

Chopra J. K. E., . (2019). Unique quintessence of general studies 2019: UPSC and state civil services preliminary examinations. : Unique Publishers, New Delhi.

Chicago

Chopra J K Ed, . 2019. Unique quintessence of general studies 2019: UPSC and state civil services preliminary examinations. : Unique Publishers, New Delhi.

Harvard

Chopra J. K. E., . (2019). Unique quintessence of general studies 2019: UPSC and state civil services preliminary examinations. : Unique Publishers, New Delhi.

MLA

Chopra J K Ed, . Unique quintessence of general studies 2019: UPSC and state civil services preliminary examinations. : Unique Publishers, New Delhi. 2019.