UMT,
Majalah, Jurnal, Buletin
Taylor, Bernard W.
Prentice-Hall, 2007
Multimedia
edited by Kenneth D. Lawrence, Gary Kleinman
Emerald, 2017
eBooks
Carolina Machado, J. Paulo Davim, editors
Springer Nature, 2019
eBooks
Asch, David, author
Crest Publishing House, 1999
Buku Referensi