- Author: Anneli Aejmelaeus
- Language: English
- Year: 1982
- Author: Walter Anderson
- Language: German
- Year: 1951
- Author: Walter Anderson
- Language: German
- Year: 1956
- Author: Erkki Salonen
- Language: German
- Year: 1975
- Author: Erkki Salonen
- Language: German
- Year: 1976
- Author: Gopala Naika, Lauri Honko
- Language: English
- Year: 1998
- Author: Heikki Koskenniemi
- Language: German
- Year: 1956
- Author: Tubach Frederic C.
- Language: English
- Year: 1969
- Author: John Lindow
- Language: English
- Year: 1997
- Author: Irma Korkkanen
- Language: English
- Year: 1975