- Author: Beth Elise Whitaker John F. Clark
- Language: English
- Year: 2018
- Author: Ebiegberi Joe Alagoa, John Pepper Clark, Nitonye Tekena Tamuno
- Language: English
- Year: 2009
- Author: John D. Clark (auth.)
- Language: English
- Year: 2009
- Author: Elisée Reclus John P. Clark (editor)
- Language: Italian
- Year: 1999
- Author: John Bates Clark
- Language: English
- Year: 2013
- Author: John P. Clark
- Language: English
- Year: 2019
- Author: John P. Clark
- Language: English
- Year: 2019
- Author: John P. Clark
- Language: English
- Year: 2019
- Author: Creswell John W Clark Vicki L Plano
- Language: English
- Year: 2018