Winzeler, Robert L.
Lanham Rowman & Littlefield, 2016
Buku Teks SO
Herman, A.L.
Westview Press, 1991
Buku Referensi
Feuchtwang, Stephan
Curzon Press , 2001
Buku Teks
Bruun, Ole
NIAS Press, 2011
Buku Teks
Coomaraswamy, Ananda K.
Philosphical Library, [Date of publication not identified]
Buku Teks