APA (7th ed.) Citation

Gould, S. (2011). 7th sigma (6th.). Tor.

Chicago Style (17th ed.) Citation

Gould, Steven. 7th Sigma. 6th. New York :: Tor, 2011.

MLA (9th ed.) Citation

Gould, Steven. 7th Sigma. 6th. Tor, 2011.

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