- Author: Mengistu Amberber, Peter Collins
- Language: English
- Year: 2002
- Author: Östen Dahl Maria Koptjevskaja-Tamm
- Language: English
- Year: 2001
- Author: Ranjit Chatterjee Paul Friedrich
- Language: English
- Year: 1989
- Author: Otomar Radina
- Language: Czech
- Year: 1977
- Author: Ярцева В.Н.
- Language: Русский
- Year: 1981
- Author: Welmers Wm.
- Language: English
- Year: 1973
- Author: Alexandra Y. Aikhenvald Robert M W Dixon
- Language: English
- Year: 2011
- Author: Кибрик А.Е.
- Language: Русский
- Year: 2003
- Author: Wallace Chafe Johanna Nichols
- Language: English
- Year: 1986