APA (7e ed.) Bronvermelding
(1989). The 1989 world book year book.: The annual supplement to the world book encyclopedia (ed.). World book, Inc..
Chicago (17e ed.) Bronvermelding
The 1989 World Book Year Book.: The Annual Supplement to the World Book Encyclopedia. ed. Chicago: World book, Inc., 1989.
MLA (9e ed.) Bronvermelding
The 1989 World Book Year Book.: The Annual Supplement to the World Book Encyclopedia. ed. World book, Inc., 1989.
Let op: Deze citaties zijn niet altijd 100% accuraat.