Ria Devita Djajasinga, author
2004
UI - Skripsi (Membership)
Noviana Mulyandini, author
2014
UI - Skripsi (Membership)
Verkuyl, J., author
Badan Penerbit Kristen, 1960
Buku Teks
Heru Cokro, author
Fakultas Psikologi Universitas Indonesia, 1999
UI - Skripsi (Membership)
Harris, Sam, author
Abdi Tandur, 2006
Buku Teks