Dyfyniad APA

Bhatnagar Aditya. (2010). Principles of environmental studies. Oxford University Press.

Dyfyniad Arddull Chicago

Bhatnagar Aditya. Principles of Environmental Studies. Delhi: Oxford University Press, 2010.

Dyfyniad MLA

Bhatnagar Aditya. Principles of Environmental Studies. Oxford University Press, 2010.

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