- Author: Lawrence Perko
- Language: English
- Year: 2013
- Author: Lawrence Perko
- Language: English
- Year: 2001
- Author: Lawrence Perko (auth.)
- Language: English
- Year: 1996
- Author: Lawrence Perko (auth.)
- Language: English
- Year: 2001
- Author: Lawrence Perko (auth.)
- Language: English
- Year: 1991
- Author: Lawrence Perko (auth.)
- Language: English
- Year: 1996
- Author: Lawrence Perko
- Language: English
- Year: 2006
- Author: Lawrence Perko
- Language: English
- Year: 2006
- Author: Lawrence Perko
- Language: English
- Year: 1990