- Author: Bolton John, Geller Pamela, Spencer Robert
- Language: English
- Year: 2010
- Author: Bolton John, Geller Pamela, Spencer Robert
- Language: English
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- Author: Horowitz David, Spencer Robert
- Language: English
- Year: 2011
- Author: Robert Spencer [Spencer Robert]
- Language: English
- Year: 2017
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- Language: English
- Year: 2009
- Author: Spencer Robert
- Language: English
- Year: 2009
- Author: Spencer Robert, Horowitz David
- Language: English
- Year: 2011
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- Language: English
- Year: 2015
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- Language: English
- Year: 2015
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- Language: English
- Year: 2011