Dyfyniad APA

Joseph, K. (2004). Essentials of environmental studies. Pearson.

Dyfyniad Arddull Chicago

Joseph, Kurian. Essentials of Environmental Studies. New Delhi: Pearson, 2004.

Dyfyniad MLA

Joseph, Kurian. Essentials of Environmental Studies. Pearson, 2004.

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