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- Language: English
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- Language: English
- Year: 1989
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- Language: English
- Year: 2006
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- Year: 1986
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- Language: English
- Year: 2007
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- Year: 1996
- Author: Florian Sauvageau, David Schneiderman, David Taras
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- Year: 1980
- Author: Roy MacLaren
- Language: English
- Year: 2004
- Author: Celia Haig-Brown, David A. Nock
- Language: English
- Year: 2006