APA Style
Inc., W, B, ,. (2001).
THE WORLD BOOK Encyclopedia 2001 VOLUME 21-W.X.Y.Z (Edition 18).
United states of America:
WORLD BOOK , Inc.
MLA Style
Inc., World, Book, ,.
"THE WORLD BOOK Encyclopedia 2001 VOLUME 21-W.X.Y.Z".
Edition 18
United states of America:
WORLD BOOK , Inc,
2001.
Text.