- Author: Edwin Hewitt, Kenneth A Ross
- Language: English
- Year: 1979
- Author: Edwin Hewitt, Kenneth A Ross
- Language: English
- Year: 1970
- Author: Edwin Hewitt Kenneth A. Ross
- Language: English
- Year: 1994
- Author: Edwin Hewitt Kenneth A. Ross
- Language: English
- Year: 1987
- Author: Edwin Hewitt Kenneth A. Ross
- Language: English
- Year: 1994