Lister-Ford, Christine, author
Sage Publications, 2002
Buku Teks
Andi Mappiare A.T., author
Rajawali, 2011
Buku Teks
Howard, George S.
Jossey-Bass, 1987
Buku Teks
Bager-Charleson, Sofie, author
Learning Matters, 2011
Buku Teks
edited by Freddy A. Paniagua, Ann-Marie Yamada
Academic Press, 2013
eBooks