- Author: Karel Werner
- Language: English
- Year: 1993
- Author: Kirsten Westergaard
- Language: English
- Year: 1985
- Author: Gir Helgesen
- Language: English
- Year: 1998
- Author: John Okell
- Language: English
- Year: 2001
- Author: Edward William Lane Stanley Lane-Poole
- Language: English
- Year: 1971
- Author: Martin Ewans
- Language: English
- Year: 2001
- Author: Kauko Laitinen
- Language: English
- Year: 1990
- Author: Göran Aijmer
- Language: English
- Year: 1984
- Author: Hans Antlov and Stein Tonnesson
- Language: English
- Year: 1995
- Author: Mason C. Hoadley and Christer Gunnarsson
- Language: English
- Year: 1996