- Author: Richard Curtis, Paul Herrick, Kevin Barrett, Robert N. Bellah, Michael Benedikt, Roland Boer, James P. Carse, Joseph Chuman, Dr. David Ray Griffin, William F. Harms
- Language: English
- Year: 2010
- Author: Carey Curtis, Nicholas Low, Professor Markus Hesse, Professor Richard Knowles
- Language: English
- Year: 2012
- Author: Steven A Cramer, Donald Curtis
- Language: English
- Year: 2018
- Author: Veechi Curtis
- Language: English
- Year: 2011
- Author: Lisa Curtis-Wendlandt
- Language: English
- Year: 2023
- Author: Drew Curtis, Christian L Hart
- Language: English
- Year: 2022
- Author: Jasmin Harounian, Grant Cooper, Joseph E. Herrera, Scott Curtis
- Language: English
- Year: 2022
- Author: Peter H. Raven (editor), Ray F. Evert (editor), Helena Curtis (editor), Rosemarie Langenfeld-Heyser (editor)
- Language: German
- Year: 1985
