8Jerome Gilson, Trademark Protection and Practice §11, Matthew Bender & Company, Inc, (2006)
9J. Thomas McCarthy, McCarthy on Trademarks and Unfair Competition (4th ed.), West Publications (2004) § 25
10John T. Cross, Contributory Infringement and Related Theories of Secondary Liability for Trademark Infringement, Iowa Law Review, Vol.80, p. 101 (1994)