APA (7th ed.) Citation

Spinellis, D., Spinellis, D., & Gousios, G. (2009). Beautiful architecture. O'Reilly Media, Inc.

Chicago Style (17th ed.) Citation

Spinellis, Diomidis, Diomidis Spinellis, and Georgios Gousios. Beautiful Architecture. Sebastopol, Calif.: O'Reilly Media, Inc, 2009.

MLA (9th ed.) Citation

Spinellis, Diomidis, et al. Beautiful Architecture. O'Reilly Media, Inc, 2009.