APA citiranje

Barrera, R. (2005). Overpromise and overdeliver: The secrets of unshakable customer loyality. Penguin.

Chicago Edition Citation

Barrera, Rick. Overpromise and Overdeliver: The Secrets of Unshakable Customer Loyality. New Delhi: Penguin, 2005.

MLA citiranje

Barrera, Rick. Overpromise and Overdeliver: The Secrets of Unshakable Customer Loyality. Penguin, 2005.