Geraldine D. Villaluz, author
Directorate of research and community engagement Universitas Indonesia, 2017
Artikel Jurnal
Karen Menke Paciorek, editor
McGraw-Hill, 2012
Buku Teks
Jannete H. Malata Silva, author
Directorate of research and community engagement Universitas Indonesia, 2017
Artikel Jurnal
Dickins, Mary, author
MGraw Hill, Open University Press, 2014
Buku Teks
Geoff Loane, author
Cambridge University Press , 2017
Artikel Jurnal