- Author: Sawyer Robert Keith
- Language: English
- Year: 2002
- Author: Sawyer Robert Keith
- Language: English
- Year: 2018
- Author: Sawyer Robert Keith
- Language: English
- Year: 2012
- Author: Entwicklungspsychologie, Kreativität, Sawyer Robert Keith
- Language: English
- Year: 2003
- Author: Marosz Jonathan, Sawyer Robert Keith
- Language: English
- Year: 2013