APA (7th ed.) Citation

Card, O. S. (2007). A war of gifts: An Ender story. Tor.

Chicago Style (17th ed.) Citation

Card, Orson Scott. A War of Gifts: An Ender Story. New York: Tor, 2007.

MLA (8th ed.) Citation

Card, Orson Scott. A War of Gifts: An Ender Story. Tor, 2007.

Warning: These citations may not always be 100% accurate.