Verbruggen, Katja, author
Coutinho, 2013
Buku Teks
Aries, Angela, author
Hodder & Stoughton, 1994
Buku Teks
Luiz Narciso Baratieri, Sylvio Monteiro Jr., Tiago Spezia de Melo, Kazuza Bueno Ferreira da Rocha
Quintessence Editora, 2014
Buku Teks
Silvester Goridus Sukur
Indonesia Cerdas, 2007
Buku Teks
Wilkes, Angela
Chicago: A Division of NTC Pub., 1987,
Buku Referensi