Cita APA (7a ed.)

World Book (Chicago). (1989). The world book encyclopedia of science (Second 1989 printing.). World Book.

Cita Chicago Style (17a ed.)

World Book (Chicago). The World Book Encyclopedia of Science. Second 1989 printing. Chicago: World Book, 1989.

Cita MLA (9a ed.)

World Book (Chicago). The World Book Encyclopedia of Science. Second 1989 printing. World Book, 1989.