edited by Russell M. Cooper
University of Minnesotta Press , 1958
Buku Teks
Justman, Joseph
Harper & Brithers , 1956
Buku Teks
Barkley, Elizabeth F., author
Jossey-Bass, 2005
Buku Teks
Eble, Kenneth E., author
Jossey-Bass, 1979
Buku Teks
Meyers, Chet, author
Jossey-Bass Publishers , 1993
Buku Teks