APA (7th ed.) Citation

Card, O. S., Brick, S., & Rudnicki, S. (2007). A war of gifts: An Ender story. Audio Renaissance.

Chicago Style (17th ed.) Citation

Card, Orson Scott, Scott Brick, and Stefan Rudnicki. A War of Gifts: An Ender Story. New York: Audio Renaissance, 2007.

MLA (8th ed.) Citation

Card, Orson Scott, et al. A War of Gifts: An Ender Story. Audio Renaissance, 2007.

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