Kale, M.R.
Motilal banarsidass publishers private limited, 1992
Buku Referensi
Macdonell, Arthur Anthony, 1854-1930
Oxford University Press, 1927
Buku Teks SO
Leech, Geoffrey N., 1936-
Edinburgh University Press, 2006
Buku Referensi
Giles, J.P.
Rigby, 1962
Buku Teks SO
Scholberg, H.C.
Oxford University Press, 1950
Buku Teks SO