APA aipamena

Hoffman, M. S. E. (1990). The world almanac and book of facts 1990.

Chicago Style aipamena

Hoffman, Mark S; Ed. The World Almanac and Book of Facts 1990. New York, World Almanac, 1990.

MLA aipamena

Hoffman, Mark S; Ed. The World Almanac and Book of Facts 1990. 1990.