APA citiranje

(2001). The World book encyclopedia: W-X-Y-Z V.21. World book, Inc.

Trích dẫn kiểu Chicago

The World Book Encyclopedia: W-X-Y-Z V.21. World book, Inc, 2001.

MLA citiranje

The World Book Encyclopedia: W-X-Y-Z V.21. World book, Inc, 2001.