Dwi Cahya Ramdani
Fakultas Ilmu Pengetahuan Budaya Universitas Indonesia, 1994
UI - Skripsi Membership
Pandikattu, Kuruvilla
The Council for Research in Values and Philosophy, 2001
Buku Teks SO
Higham, Nicholas J., 1961-
Routledge, 2006
Buku Teks SO
West, E.G.
Airlington House, 1969
Buku Teks SO
Millett, John
South Head Press, 1971
Buku Teks SO