एपीए उद्धरण

(1969). U.S book of facts statistics and information. Essendess.

शिकागो स्टाइल उद्धरण

U.S Book of Facts Statistics and Information. New York: Essendess, 1969.

एमएलए उद्धरण

U.S Book of Facts Statistics and Information. Essendess, 1969.