- Author: Robert H. Webb, Julio L. Betancourt, R. Roy Johnson, Raymond M. Turner, Bernard L. Fontana
- Language: English
- Year: 2014
- Author: Yashwant R. Mahajan Roy Johnson
- Language: English
- Year: 2020
- Author: Roy Johnson (auth.) R. Johnson G. J. Jellis (eds.)
- Language: English
- Year: 1992