Cita APA (7a ed.)
(1991). Science year 1992: The world book annual science supplement. The World Book,Inc.
Cita Chicago Style (17a ed.)
Science Year 1992: The World Book Annual Science Supplement. Chicago: The World Book,Inc, 1991.
Cita MLA (9a ed.)
Science Year 1992: The World Book Annual Science Supplement. The World Book,Inc, 1991.
Precaución: Estas citas no son 100% exactas.