Ducanis, Alex J.
Aspen Publication, 1979
Buku Teks
Carole Kenner, Judy Wright Lott
Saunders Elsevier, 2007
Buku Teks
Mclaughnin, Curtis P.
Jones & Bartlett Learning, 2015
Buku Teks
Collins, Charles
Oxford University Press, 1994
Buku Teks
Pynes, Joan
Jossey-Bass, 2011
Buku Teks