Cita APA

(1987). The world almanac and book of facts 19 (1.). [S.l.]: New York, US. : Scripps Horward.

Citación estilo Chicago

The World Almanac and Book of Facts 19. 1. [S.l.]: New York, US. : Scripps Horward, 1987.

Cita MLA

The World Almanac and Book of Facts 19. 1. [S.l.]: New York, US. : Scripps Horward, 1987.