Solso, Robert L., 1933-, author
Boston, 2002
Buku Teks
Schenck, Hilbert
Buku Teks
Bernardin, H. John, author
McGraw-Hil, 1993
Buku Teks
Wilcox, Charles F., 1930-, author
Prentice-Hall, 1995
Buku Teks
Bryant, Peter, 1937-, author
Basic Books, 1974
Buku Teks