Dyfyniad APA

(2010). The environment encyclopedia and directory 2010 (5th ed.). Routledge.

Dyfyniad Arddull Chicago

The Environment Encyclopedia and Directory 2010. 5th ed. Singer street, London: Routledge, 2010.

Dyfyniad MLA

The Environment Encyclopedia and Directory 2010. 5th ed. Routledge, 2010.

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