Bender, David L.
Grennhaven Press, 1981
Buku Teks SO
Ajarananda, Swami
Thai Bidhaya Press, [Date of publication not identified]
Buku Klasik
Downes, William
Cambridge University Press, 2011
eBooks
Dampier, William Cecil
Cambridge University Press, 1989
Buku Teks SO
Hood, Daniel E.
Transaction, 2011
Buku Teks SO