Karen Menke Paciorek, editor
McGraw-Hill, 2012
Buku Teks
Jannete H. Malata Silva
Directorate of research and community engagement Universitas Indonesia, 2017
Artikel Jurnal
Dickins, Mary
MGraw Hill, Open University Press, 2014
Buku Teks
Geoff Loane
Cambridge University Press , 2017
Artikel Jurnal
Holida Lafrisyah
Universitas Indonesia, 2012
UI - Tesis (Open)