एपीए उद्धरण

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

शिकागो स्टाइल उद्धरण

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

एमएलए उद्धरण

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