- Author: Greg Elmer
- Language: English
- Year: 2002
- Author: DAVID W. MAURER
- Language: English
- Year: 1964
- Author: Donald P Kommers, John E Finn, Gary J Jacobsohn
- Language: English
- Year: 2010
- Author: Donald P Kommers, John E Finn, Gary J Jacobsohn
- Language: English
- Year: 2010