- Author: Willenbrink Mark, Willenbrink Mary
- Language: English
- Year: 2012
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- Language: English
- Year: 2014
Drawing Portraits for the Absolute Beginner: A Clear & Easy Guide to Successful Portrait Drawing
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- Language: English
- Year: 2012
- Author: Willenbrink Mark, Willenbrink Mary
- Language: English
- Year: 2013
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- Language: English
- Year: 2013
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- Language: English
- Year: 2006
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- Language: English
- Year: 2006
- Author: Willenbrink Mark, Willenbrink Mary
- Language: English
- Year: 2012
- Author: Willenbrink Mark, Willenbrink Mary
- Language: English
- Year: 2010