Citazione Stile APA (7a Edizione)

World Resources Institute. (1993). The 1993 Information Please Environmental Almanac. Houghton Mifflin.

Citazione stile Chigago Style (17a edizione)

World Resources Institute. The 1993 Information Please Environmental Almanac. Boston, New York: Houghton Mifflin, 1993.

Citatione MLA (9a ed.)

World Resources Institute. The 1993 Information Please Environmental Almanac. Houghton Mifflin, 1993.