- Author: Ian M. Church, Robert J. Hartman
- Language: English
- Year: 2019
- Author: Ian M. Church, Robert J. Hartman
- Language: English
- Year: 2019
- Author: Robert S. Hartman Arthur R. Ellis Rem B. Edwards
- Language: English
- Year: 1994
- Author: Salvador Roquet Pierre Favreau Robert S. Hartman
- Language: Spanish
- Year: 1981
- Author: Abraham H. Maslow Robert S. Hartman Daisetz Teitaro Suzuki Erich Fromm etc.
- Language: English
- Year: 1970
- Author: Robert S. Hartman Arthur R. Ellis Rem B. Edwards
- Language: English
- Year: 2002
- Author: Robert S. Hartman
- Language: Spanish
- Year: 1965
- Author: Robert S. Hartman
- Language: Spanish
- Year: 1959
- Author: Robert S. Hartman
- Language: English
- Year: 2002
- Author: Robert S. Hartman
- Language: English
- Year: 1967