APA (7th ed.) Citation

University Of Chicago. (1991). Britannica Book of the year. Encyclopedia Britannica, Inc.

Chicago Style (17th ed.) Citation

University Of Chicago. Britannica Book of the Year. Toronto: Encyclopedia Britannica, Inc, 1991.

MLA (9th ed.) Citation

University Of Chicago. Britannica Book of the Year. Encyclopedia Britannica, Inc, 1991.

Warning: These citations may not always be 100% accurate.