Merriam, E., & Duke, B. (1998). What in the world? HarperCollins.
Cita Chicago Style (17a ed.)Merriam, Eve, y Barbara Duke. What in the World? New York: HarperCollins, 1998.
Cita MLA (8a ed.)Merriam, Eve, y Barbara Duke. What in the World? HarperCollins, 1998.
Precaución: Estas citas no son 100% exactas.