Sheldon, S. (2001). The sky is falling. Compass Press, HarperCollins Publishers.
Cita Chicago Style (17a ed.)Sheldon, Sidney. The Sky Is Falling. London ; Oxford ; Melbourne: Compass Press, HarperCollins Publishers, 2001.
Cita MLA (8a ed.)Sheldon, Sidney. The Sky Is Falling. Compass Press, HarperCollins Publishers, 2001.
Precaución: Estas citas no son 100% exactas.