APA (7th ed.) Citation

Saint-André, P., Smith, K., & Troncon, R. (2009). XMPP: The definitive guide. O'Reilly Media, Inc..

Chicago Style (17th ed.) Citation

Saint-André, Peter, Kevin Smith, and Remko Troncon. XMPP: The Definitive Guide. Sebastopol, Calif.: O'Reilly Media, Inc., 2009.

MLA (9th ed.) Citation

Saint-André, Peter, et al. XMPP: The Definitive Guide. O'Reilly Media, Inc., 2009.