एपीए उद्धरण

Surender Singh. (2018). General studies: For Civil Services preliminary examination: Paper I. Mc Graw Hill India.

शिकागो स्टाइल उद्धरण

Surender Singh. General Studies: For Civil Services Preliminary Examination: Paper I. Chennai: Mc Graw Hill India, 2018.

एमएलए उद्धरण

Surender Singh. General Studies: For Civil Services Preliminary Examination: Paper I. Mc Graw Hill India, 2018.