CA Jossey-Bass, 2014
Buku Teks
Healey, Bernard J.
Jones & Bartlett Learning, 2010
Buku Teks
Allender, Judith Ann
Wolters Kluwer, 2014
Buku Teks
Porterfield, John D.
Voice American Forum Lecture, [date of publication not identified]
Buku Teks
Falmer Press, 1985
Buku Teks