एपीए उद्धरण

Sharma, J. P. Environmental Studies (3rd ed.). University Science Press.

शिकागो स्टाइल उद्धरण

Sharma, J P. Environmental Studies. 3rd ed. Bangalore: University Science Press.

एमएलए उद्धरण

Sharma, J P. Environmental Studies. 3rd ed. University Science Press.