APA (7th ed.) Citation

GODIN. (2003). Purple cow: Transform your business by being remarkable. Portfolio.

Chicago Style (17th ed.) Citation

GODIN. Purple Cow: Transform Your Business by Being Remarkable. New York: Portfolio, 2003.

MLA (9th ed.) Citation

GODIN. Purple Cow: Transform Your Business by Being Remarkable. Portfolio, 2003.

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