- Author: Wentzel Van Huyssteen Niels Henrik Gregersen Nancy R. Howell Wesley J. Wildman
- Language: English
- Year: 2003
- Author: Niels Henrik Gregersen Nancy R. Howell Wesley J. Wildman Wentzel Van Huyssteen
- Language: English
- Year: 2003
- Author: Wentzel Van Huyssteen Niels Henrik Gregersen Nancy R. Howell Wesley J. Wildman
- Language: English
- Year: 2003
- Author: Niels Henrik Gregersen
- Language: English
- Year: 2002
- Author: Niels Henrik Gregersen Nancy R. Howell Wesley J. Wildman Wentzel Van Huyssteen
- Language: English
- Year: 2003
- Author: Niels Henrik Gregersen
- Language: English
- Year: 2002