एपीए उद्धरण

(1999). Chemistry for civil services preliminary examionation. Sudha.

शिकागो स्टाइल उद्धरण

Chemistry for Civil Services Preliminary Examionation. New Delhi: Sudha, 1999.

एमएलए उद्धरण

Chemistry for Civil Services Preliminary Examionation. Sudha, 1999.