Παραπομπή APA

Ketzner, K. (1977). The Language of the World. Routledge & Kegan Paul.

Παραπομπή Chicago Style

Ketzner, Kenneth. The Language of the World. London: Routledge & Kegan Paul, 1977.

Παραπομπή MLA

Ketzner, Kenneth. The Language of the World. Routledge & Kegan Paul, 1977.