एपीए उद्धरण

(1970). Britannica book of the year 1970. Chicago: William Benton.

शिकागो स्टाइल उद्धरण

Britannica Book of the Year 1970. Chicago: William Benton, 1970.

एमएलए उद्धरण

Britannica Book of the Year 1970. Chicago: William Benton, 1970.