Barkley, Elizabeth F., author
Jossey-Bass, 2005
Buku Teks
edited by Russell M. Cooper
University of Minnesotta Press , 1958
Buku Teks
Bellings, Diane M., author
Saunders Elsevier, 2009
Buku Teks
Justman, Joseph
Harper & Brithers , 1956
Buku Teks
Meyers, Chet, author
Jossey-Bass Publishers , 1993
Buku Teks