APA (7th ed.) Citation
(1989). <The> 1989 World Book Year Book: <The> Annual Supplement to The World Book Encyclopedia (1. ed.). World Book.
Chicago Style (17th ed.) Citation
<The> 1989 World Book Year Book: <The> Annual Supplement to The World Book Encyclopedia. 1. ed. Chicago: World Book, 1989.
MLA (9th ed.) Citation
<The> 1989 World Book Year Book: <The> Annual Supplement to The World Book Encyclopedia. 1. ed. World Book, 1989.
Warning: These citations may not always be 100% accurate.