Citazione Stile APA (7a Edizione)

(2001). The Environment encyclopedia and directory (3rd ed.). Europa Publications Limited.

Citazione stile Chigago Style (17a edizione)

The Environment Encyclopedia and Directory. 3rd ed. London: Europa Publications Limited, 2001.

Citatione MLA (9a ed.)

The Environment Encyclopedia and Directory. 3rd ed. Europa Publications Limited, 2001.