Alexander Seran, author
Pusat Pengembangan Etika Unika Atma Jaya, 2015
Artikel Jurnal
[publisher not identified], [date of publication not identified]
Buku Teks
Mentari Meina Rahmalah, author
Universitas Indonesia, 2008
UI - Skripsi (Open)
1999
Buku Teks
Budi Irawanto, author
Media Pressindo, 1999
Buku Teks