- Author: Franz Altheim, Ruth Stiehl, János Harmatta, Dieter Harnack, Roch Knapowski, Franz F. Schwarz, Zuhair Shunnar, Oswald Szemerényi, Erika Trautmann-Nehring
- Language: German
- Year: 1970
- Author: Oswald Szemerényi
- Language: English
- Year: 1977
- Author: Oswald Szemerényi
- Language: German
- Year: 1989
- Author: Oswald Szemerényi
- Language: English
- Year: 1964