Litbang Sekolah Tinggi Filsafat Teologi Widya Sasana, {s.a.}
Majalah, Jurnal, Buletin
Ali Mudhofir
Gadjah Mada University Press, 1996
Buku Teks
Descrates, Rene
J.M. Dent & Sons , 1949
Buku Teks SO
Muthahhari, Murtadha
Islamic Center Jakarta , 2002
Buku Teks SO
editor, I. Wibowo; B. Herry Priyono
Kanisius, 2006
Buku Teks SO