- Author: Lewars Harriet E J Bertschinger Richard
- Language: English
- Year: 2012
- Author: Errol Lewars (auth.)
- Language: English
- Year: 2003
- Author: Errol G. Lewars (auth.)
- Language: English
- Year: 2011
- Author: Errol G. Lewars (auth.)
- Language: English
- Year: 2016
- Author: Errol G. Lewars (auth.)
- Language: English
- Year: 2008
- Author: Errol G. Lewars
- Language: English
- Year: 2003
- Author: Errol G. Lewars (auth.)
- Language: English
- Year: 2011
- Author: Errol G. Lewars (auth.)
- Language: English
- Year: 2008
- Author: Errol G. Lewars
- Language: English
- Year: 2003
- Author: Errol G. Lewars
- Language: English
- Year: 2003