- Author: Professor Dr. Tönu Puu (auth.)
- Language: English
- Year: 2006
- Author: Professor Tönu Puu (auth.)
- Language: English
- Year: 1989
- Author: Tönu Puu (auth.)
- Language: English
- Year: 2011
- Author: Tönu Puu (auth.) Professor Dr. Tönu Puu Dr. Irina Sushko (eds.)
- Language: English
- Year: 2002
- Author: Prof. Tönu Puu (auth.)
- Language: English
- Year: 2000
- Author: Professor Dr. Tönu Puu (auth.)
- Language: English
- Year: 1997