Dyfyniad APA

Turk, J. (1985). An introduction to environmental studies. Philadelphia: Saunders.

Dyfyniad Arddull Chicago

Turk, Jonathan. An Introduction to Environmental Studies. Philadelphia: Saunders, 1985.

Dyfyniad MLA

Turk, Jonathan. An Introduction to Environmental Studies. Philadelphia: Saunders, 1985.

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