Michael Ratna Dwijanti, author
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2004
UI - Skripsi (Membership)
Artikel Jurnal
Unamuno, Miguel de, author
Dover Publication, 1945
Buku Teks
Aydin, Mahmut
The Council for Research in Values and Philosophy, 2002
Buku Teks
Mir-Kasimo, Orkhan, author
Brill, 2017
eBooks