- Author: Harri Kettunen, Christophe Helmke
- Language: Spanish
- Year: 2004
- Author: Harri Kettunen Christophe Helmke
- Language: English
- Year: 2020
- Author: Merita Kettunen
- Language: English
- Year: 2020
- Author: Kettunen Harri.
- Language: Indigenous-English
- Author: Lauri Kettunen
- Language: German
- Year: 1938
- Author: Harri Kettunen Christophe Helmke
- Language: Castellano
- Year: 2011
- Author: Harri Kettunen Christophe Helmke
- Language: English
- Year: 2014
- Author: Pentti O. Kettunen
- Language: English
- Year: 2009