Dwi Cahya Ramdani
Fakultas Ilmu Pengetahuan dan 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
[publisher not identified], [date of publication not identified]
Naskah
[publisher not identified], [date of publication not identified]
Naskah