- Author: Peter Heehs
- Language: English
- Year: 2013
- Author: Peter Heehs
- Language: English
- Year: 2019
- Author: Peter Heehs
- Language: English
- Year: 1988
- Author: Peter Heehs
- Language: English
- Year: 2018
- Author: Peter Heehs
- Language: English
- Year: 2018
- Author: Peter Heehs
- Language: English
- Year: 1998
- Author: Peter Heehs
- Language: English
- Year: 1994
- Author: Peter Heehs
- Language: English
- Year: 2004
- Author: Peter Heehs
- Language: English
- Year: 2008
- Author: Peter Heehs
- Language: English
- Year: 1993