एपीए उद्धरण

DE RAJ KHANNA. ECOLOGY AND POLLUTION OF GANGA RIVER. ASHISH PUBLISHING HOUSE.

शिकागो स्टाइल उद्धरण

DE RAJ KHANNA. ECOLOGY AND POLLUTION OF GANGA RIVER. ASHISH PUBLISHING HOUSE.

एमएलए उद्धरण

DE RAJ KHANNA. ECOLOGY AND POLLUTION OF GANGA RIVER. ASHISH PUBLISHING HOUSE.