Cita APA (7a ed.)

Encyclopaedia Britannica, Inc, & Sparks, K. J. (2009). Encyclopaedia Britannica 2009 book of the year. Encyclopaedia Britannica, Inc.

Cita Chicago Style (17a ed.)

Encyclopaedia Britannica, Inc, y Karen Jacobs Sparks. Encyclopaedia Britannica 2009 Book of the Year. Chicago: Encyclopaedia Britannica, Inc, 2009.

Cita MLA (9a ed.)

Encyclopaedia Britannica, Inc, y Karen Jacobs Sparks. Encyclopaedia Britannica 2009 Book of the Year. Encyclopaedia Britannica, Inc, 2009.