9Melvile B. Nimmer & David Nimmer, Nimmer on Copyright,Matthew Bender & Company, Inc., Chapter 12.04 [ A][2] (2003).
10Q Restatement of the Law, Second, Torts,§ 876; Fowler Harper, Fleming James & Oscar Gray, The Law of Torts (2nd Edition),§ 10.1, Little Brown and Co. (1986).