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- Language: English
- Year: 1961
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- Language: English
- Year: 1992
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- Language: English
- Year: 1981
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- Language: English
- Year: 2007
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- Language: English
- Year: 1994
- Author: Michael Nylan
- Language: English
- Year: 2011
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- Language: English
- Year: 2010
- Author: Ringe Donald A.
- Language: English
- Year: 1996
- Author: Kemal Balkan
- Language: German
- Year: 1954