APA (7th ed.) Citation

Lenssen, P. (2008). Google apps hacks. O'Reilly.

Chicago Style (17th ed.) Citation

Lenssen, Philipp. Google Apps Hacks. Beijing ; Sebastopol, CA: O'Reilly, 2008.

MLA (9th ed.) Citation

Lenssen, Philipp. Google Apps Hacks. O'Reilly, 2008.

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