- Author: J. A. B. van Buitenen
- Language: English
- Year: 1962
- Author: Peter Gaeffke
- Language: German
- Year: 1967
- Author: J. C. Heesterman
- Language: English
- Year: 1957
- Author: T. Goudriaan (editor)
- Language: English
- Year: 1965
- Author: Jan Gonda (editor)
- Language: English
- Year: 1957