- Author: Galen, David J. Furley, James S. Wilkie
- Language: English
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- Year: 2012
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- Year: 2018
- Author: Recorded Books Inc., Anderson Leith, Carey Galen
- Language: English
- Year: 2016
- Author: Strawson Galen
- Language: English
- Year: 2017
- Author: Gruman Galen
- Language: English
- Year: 2013
- Author: Gruman Galen
- Language: English
- Year: 2008
- Author: Gruman Galen
- Language: English
- Year: 2010
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- Language: English
- Year: 2012
- Author: Cranz Galen
- Language: English
- Year: 2016