Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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