- Author: Robert Earl Sutter
- Language: English
- Year: 2014
- Author: Robert Earl Stewart
- Language: English
- Year: 2021
- Author: Robert Earl Haney, Lee Courtnage
- Language: English
- Year: 2011
- Author: Robert Earl Kelley
- Language: English
- Year: 1999
- Author: Robert Earl Kaske Arthur Groos Michael W. Twomey
- Language: English
- Year: 1988
- Author: Robert Earl Patterson Ph.D. (auth.)
- Language: English
- Year: 2015
- Author: Robert Earl
- Language: English
- Year: 2004