edited by Lani Florian
Sage Publications, 2014
Buku Referensi
Gross, Jean, author
Routledge: Taylor & Francis Group, 2008
Buku Teks
Kwak, Duck-Joo
Springer, 2012
eBooks
Hastings, W.K., author
Victoria University Press, 1990
Buku Teks
Yell, Mitchell L.
Prentice-Hall, 1998
Buku Teks