Farrington, B.
Henry Schuman, 1949
Buku Teks
Marinoff, Lou, author
Dialogue Path Press, 2012
Buku Teks
David Solomon
Springer, 2012
eBooks
George, Richard T. de
Regents Press of Kansas, 1980
Buku Referensi
Muthahhari, Murtadha, author
Al-Huda, 2004
Buku Teks