Goodman, Arthur, author
Grove Brooks/Cole, 2000
Buku Teks
Bodenheimer, Thomas S., author
Appleton & Lange, 1995
Buku Teks
Eadie, Edward N., autohr
[, Springer], 2012
eBooks
Heider, Karl G., author
University of Texas Press, 1976.
Buku Teks
Jim Mcgoldrick, editor
Routledge, 2001
Buku Teks