APA

(1994). The World Book. Encyclopedia. Volume 15: P. Chicago: World Book, Inc.

Chicago

1994. The World Book. Encyclopedia. Volume 15: P. Chicago: World Book, Inc.

Harvard

(1994). The World Book. Encyclopedia. Volume 15: P. Chicago: World Book, Inc.

MLA

The World Book. Encyclopedia. Volume 15: P. Chicago: World Book, Inc. 1994.