Stokhof, W. A. L., author
[T.t.] Rodpi 1980
Buku Teks
Edited by Nicholas J. Cox, H. Joseph Newton
Stata Press, 2014
Buku Teks
edited by Stuart C. Brown, Diane Collinson, Robert Wilkinson
Routledge, 1998
Buku Teks
New Delhi Encyclopaedia Britannica 2001
Buku Referensi
Penniman, T.K.
Duckworth, 1935
Buku Teks