APA Style

Inc., W, B. (2004). The World Book Encyclopedia, Volume 18: So–Sz (Latest standard edition (commonly annual — confirm). Chicago, Illinois, USA: World Book, a Scott Fetzer Company.

MLA Style

Inc., World, Book,. "The World Book Encyclopedia, Volume 18: So–Sz". Latest standard edition (commonly annual — confirm Chicago, Illinois, USA: World Book, a Scott Fetzer Company, 2004. BOOK.