Callahan, David (2002). Kindred spirits: Harvard Business School's extraordinary class of 1949 and how they transformed American business. Hoboken, N.J.: J. Wiley. ISBN978-0-471-41819-1. OCLC50630480.
Callahan, David (2004). The cheating culture: why more Americans are doing wrong to get ahead. Orlando, Fla.: Harcourt. p. 366. ISBN978-0-15-603005-2. OCLC858674447.