एपीए उद्धरण

Gupta, A.. Synthetic and natural Rock Systems. Allied Publishers.

शिकागो स्टाइल उद्धरण

Gupta, Alok.K. Synthetic and Natural Rock Systems. Allied Publishers.

एमएलए उद्धरण

Gupta, Alok.K. Synthetic and Natural Rock Systems. Allied Publishers.