Pojman, Louis P.
English : 6th ed., International ed., 2012
Buku Teks
Ajarananda, Swami
Thai Bidhaya Press, [date of publication not identified]
Buku Klasik
Clack, Brian R.
Polity Press, 2008
Buku Teks
edited by Andrew Eshleman
Blackwell, 2008
Buku Teks
Savi, Julio
Royal Falcon Books, 2012
Buku Teks