Style de citation APA (7e éd.)
(1990). Year Book. The 1990 World Book: A Review of the Events of 1989.The Annual Supplement to The World Book Encyclopedia. The World Book,Inc.
Style de citation Chicago (17e éd.)
Year Book. The 1990 World Book: A Review of the Events of 1989.The Annual Supplement to The World Book Encyclopedia. Chicago: The World Book,Inc, 1990.
Style de citation MLA (9e éd.)
Year Book. The 1990 World Book: A Review of the Events of 1989.The Annual Supplement to The World Book Encyclopedia. The World Book,Inc, 1990.
Attention : ces citations peuvent ne pas être correctes à 100%.