एपीए उद्धरण

Singh, M. (2005). Environment and natural resources. satish serial publications.

शिकागो स्टाइल उद्धरण

Singh, M.P. Environment and Natural Resources. Delhi: satish serial publications, 2005.

एमएलए उद्धरण

Singh, M.P. Environment and Natural Resources. satish serial publications, 2005.