Card, O. S. (2007). A war of gifts: An Ender story. Tor.
Cita Chicago Style (17a ed.)Card, Orson Scott. A War of Gifts: An Ender Story. New York: Tor, 2007.
Cita MLA (8a ed.)Card, Orson Scott. A War of Gifts: An Ender Story. Tor, 2007.
Precaución: Estas citas no son 100% exactas.