Dyfyniad APA

Joseph, B. (2004). Environmental studies. Tata McGraw-Hill.

Dyfyniad Arddull Chicago

Joseph, Benny. Environmental Studies. New Delhi: Tata McGraw-Hill, 2004.

Dyfyniad MLA

Joseph, Benny. Environmental Studies. Tata McGraw-Hill, 2004.

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