- Author: Morris Halle, Paul E. Gray
- Language: English
- Year: 1984
- Author: Paul E. Gray Campbell L. Searle
- Language: English
- Year: 1969
- Author: Paul R. Gray ... [et al.].
- Language: English
- Author: Paul R. Gray Robert G. Meyer
- Language: Italian
- Year: 1997
- Author: Paul E. Gray, David DeWitt, A.R. Boothroyd, James F. Gibbons, Roberto Plana Abadía, Julián Fernández Ferrer
- Language: Spanish
- Year: 1970
- Author: Paul E. Gray, David DeWitt, A.R. Boothroyd, James F. Gibbons, Roberto Plana Abadía, Julián Fernández Ferrer
- Language: Spanish
- Year: 1970
- Author: Paul Christopher Gray (ed.)
- Language: English
- Year: 2018
- Author: Asad A. Abidi Paul R. Gray Robert G. Meyer
- Language: English
- Year: 1998
- Author: Paul R. Gray
- Language: English
- Year: 2009