एपीए उद्धरण

(1999). UPSC (IES) Engineering Services Examination Papers, Solved and Unsolved: Civil Engineering. G.K.

शिकागो स्टाइल उद्धरण

UPSC (IES) Engineering Services Examination Papers, Solved and Unsolved: Civil Engineering. Jabalpur: G.K, 1999.

एमएलए उद्धरण

UPSC (IES) Engineering Services Examination Papers, Solved and Unsolved: Civil Engineering. G.K, 1999.