Artikel Jurnal
Gabriel Possenti Shindunata, author
Gramedia, 2006
Buku Teks
Meyer, Joyce, author
Gospel Pres, 2005
Buku Teks
Albertus Christian Dwi Jayanto, author
2017
UI - Skripsi (Membership)
Henny Eunike Wirawan, author
Fakultas Psikologi Universitas Indonesia, 1995
UI - Skripsi (Membership)