Artikel Jurnal
Arnold, Johann Christoph
Grasindo, 2002
Buku Teks
Meyer, Joyce, author
Gospel Pres, 2005
Buku Teks
Peale, Norman Vincent, 1898-1993, author
Binarupa Aksara, 1993
Buku Teks
Deacy, Christopher, author
Blackwell Publishing, 2008
Buku Teks