Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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