Citazione Stile APA (7a Edizione)

Katzner, K. (2002). The languages of the world (3rd ed.). Routledge.

Citazione stile Chigago Style (17a edizione)

Katzner, Kenneth. The Languages of the World. 3rd ed. London: Routledge, 2002.

Citatione MLA (9a ed.)

Katzner, Kenneth. The Languages of the World. 3rd ed. Routledge, 2002.