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- Language: English
- Year: 2005
- Author: Colin S. Gray.
- Language: English
- Year: 2007
- Author: C. Neal Tate
- Language: English
- Year: 2005
- Author: C. Neal Tate
- Language: English
- Year: 2005
- Author: John M. Hobson
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- Year: 2000
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- Language: English
- Year: 2007
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- Year: 2006
- Author: Peter Sutch Juanita Elias
- Language: English
- Year: 2007
- Author: Nancy Snow Philip M. Taylor
- Language: English
- Year: 2009
- Author: Martin Griffiths
- Language: English
- Year: 1992