Lickona, Thomas, author
Bumi Aksara, 2016
Buku Teks
Rahma Damayanti, author
2008
UI - Tesis (Membership)
Amilia Rachma Aminy, author
1997
UI - Skripsi (Membership)
Tynan, Bernadette, author
Gramedia Pustaka Utama, 2005
Buku Teks
Melania Putri Parman, author
Fakultas Psikologi Universitas Indonesia, 2002
UI - Skripsi (Membership)