- Author: Hemant Rawat
- Language: English
- Year: 2007
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- Language: English
- Year: 2003
- Author: Кушнір Сарнацька
- Language: Ukrainian
- Year: 2005
- Author: Kirsi-Marja Oksman-Caldentey Wolfgang H. Barz
- Language: English
- Year: 2002
- Author: Victoriano Valpuesta
- Language: English
- Year: 2002
- Author: Peter C. Morris James H. Bryce
- Language: English
- Year: 2000