Cita APA

(1971). Britannica book of the year 1971. Chicago: William Benton.

Chicago Style Citation

Britannica Book of the Year 1971. Chicago: William Benton, 1971.

Cita MLA

Britannica Book of the Year 1971. Chicago: William Benton, 1971.

Atenció: Aquestes cites poden no estar 100% correctes.