Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.