- Author: Ralph Vince
- Language: English
- Year: 1992
- Author: Ralph H. Thornburgh
- Language: English
- Year: 1999
- Author: Andrea M. Guilliatt (auth.) Bimal D. M. Theophilus Ralph Rapley (eds.)
- Language: English
- Year: 2002
- Author: Ralph Rapley
- Language: English
- Year: 1996
- Author: Ralph Rapley David L. Manning
- Language: English
- Year: 1998
- Author: Ralph Rapley
- Language: English
- Year: 2000
- Author: V.S. Ramachandran Ralph M. Haber James J. Beaudoin Ana H. Delgado
- Language: English
- Year: 2003
- Author: Ralph Morelli Ralph Walde
- Language: English
- Year: 2006
- Author: Ralph L. Kliem Irwin S. Ludin
- Language: English
- Year: 1998
