- Author: Robert Butler, Robert Bateman
- Language: English
- Year: 1997
- Author: Jerry W. Ward, Robert J. Butler, Robert J Butler
- Language: English
- Year: 2008
- Author: Minasi Mark, Greene Kevin, Booth Christian, Butler Robert, McCabe John, Panek Robert, Rice Michael, Roth Stefan
- Language: English
- Year: 2014
- Author: Butler Robert Brown
- Language: English
- Year: 1981
- Author: S.T. Butler Robert Raymond
- Language: Portuguese
- Year: 1979
- Author: Butler Alexandra, Butler Robert N., Lewis Myrna I
- Language: English
- Year: 2015
- Author: Butler Alexandra, Butler Robert N., Lewis Myrna I
- Language: English
- Year: 2015
- Author: Joe Bindloss Stuart Butler Robert Reid
- Language: English
- Year: 2009