APA (7th ed.) Citation

Williams, S., Dix, S., & Moore, C. (2002). Echoes of earth (Ace mass-market edition.). Ace Books.

Chicago Style (17th ed.) Citation

Williams, Sean, Shane Dix, and Chris Moore. Echoes of Earth. Ace mass-market edition. New York, N.Y.: Ace Books, 2002.

MLA (9th ed.) Citation

Williams, Sean, et al. Echoes of Earth. Ace mass-market edition. Ace Books, 2002.