Pieris, John, author
Yayasan Obor Indonesia, 2004
Buku Teks
Patten, Chris
Macmillan, 1998
Buku Teks
Zika Zakiya, author
Universitas Indonesia, 2009
UI - Skripsi (Open)
Ingleson, John, author
LP3ES, 1988
Buku Teks
Lachica, Eduardo
Solidaridad Publishing House, 1971
Buku Teks