- Author: Laurence J. Peter Raymond Hull
- Language: Italian
- Year: 2008
- Author: Dr. Laurence J. Peter
- Language: English
- Year: 2013
- Author: Laurence J. Peter
- Language: Polish
- Year: 1977
- Author: Laurence J. Peter Raymond Hull
- Language: English
- Year: 1969
- Author: Laurence J. Peter
- Language: English
- Year: 1996
A Peter-elv
mobi
- Author: Laurence J. Peter Raymond Hull
- Language: Hungarian
- Year: 1989
A Peter-elv
epub
- Author: Laurence J. Peter Raymond Hull
- Language: Hungarian
- Year: 1989
A Peter-elv
pdf
- Author: Laurence J. Peter Raymond Hull
- Language: Hungarian
- Year: 1989
- Author: Laurence J. Peter & Raymond Hull
- Language: Spanish