Luft, Joseph
National Press Books, 1970
Buku Teks
Luft, Joseph
Mayfield Publishing Company, 1984
Buku Teks
Shaw, Marvin E.
New York, 1981
Buku Teks
edited by Graham S. Gibbard, John J. Hartman, Richard D. Mann
Jossey-Bass, 1976
Buku Teks
editor, Lawrence R. Frey
Sage, 2002
Buku Teks