- Author: Gamma Erich, Helm Richard, Johnson Ralph, Vlissides John
- Language: English
- Year: 1994
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- Language: English
- Year: 1994
- Author: Blair J. Anthony, Johnson Ralph Henry
- Language: English
- Year: 2006
- Author: Gamma Erich, Helm Richard, Johnson Ralph, Vlissides John
- Language: English
- Year: 2000
- Author: Gamma Erich, Helm Richard, Johnson Ralph E., Vlissides John
- Language: English
- Year: 2016
- Author: Gamma Erich & johnson Ralph & Helm Richard & Vlissides john
- Language: Portuguese
- Year: 2000
- Author: Johnson Ralph Henry, Blair J. Anthony
- Language: English
- Year: 1994