Godin, S. (1999). Permission marketing: Turning strangers into friends, and friends into customers. Simon & Schuster.
Chicago-viite (17. p.)Godin, Seth. Permission Marketing: Turning Strangers into Friends, and Friends into Customers. New York: Simon & Schuster, 1999.
MLA-viite (8. p.)Godin, Seth. Permission Marketing: Turning Strangers into Friends, and Friends into Customers. Simon & Schuster, 1999.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.