Cita APA (7a ed.)
(1992). Science year 1993: The Worlds book annual science supplement. The World Book,Inc.
Cita Chicago Style (17a ed.)
Science Year 1993: The Worlds Book Annual Science Supplement. Chicago: The World Book,Inc, 1992.
Cita MLA (9a ed.)
Science Year 1993: The Worlds Book Annual Science Supplement. The World Book,Inc, 1992.
Precaución: Estas citas no son 100% exactas.