Παραπομπή APA

Cowles Education Corporation. (1968). Cowles encyclopedia of nations. Cowles Education Corp.

Παραπομπή Chicago Style

Cowles Education Corporation. Cowles Encyclopedia of Nations. [New York]: Cowles Education Corp, 1968.

Παραπομπή MLA

Cowles Education Corporation. Cowles Encyclopedia of Nations. Cowles Education Corp, 1968.