Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

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