Gonda, Jan, 1905-1991
International Academy of Indian Culture, 1952
Buku Referensi
Burrow, T.
Faber and Faber, [date of publication not identified]
Buku Teks SO
Departemen Urusan Research Nasional, 1965
Buku Teks SO
Perry, Edward Delavan
Columbia University Press, 1959
Buku Teks
Lanman, Charles Rockwell, 1850-1941
Harvard University Press, 1955
Buku Teks