Heider, Karl G., author
University of Texas Press, 1976.
Buku Teks
Lindgren, Ernest, author
Collier Books, 1970
Buku Teks
edited by Jill Nelmes
Routledge, 1996
Buku Teks
Bettetini, Gianfranco, author
Mouton, 1973
Buku Teks
Burch, Noel
Praeger 1, 1973
Buku Teks