edited by Fred McKinney
Macmillan, 1967
Buku Teks
Kolb, David A.
Prentice-Hall, 1974
Buku Teks SO
Bass, Bernard M.
Allyn and Bacon, 1979
Buku Teks SO
Nicolson, Paula
MacMillan Education, 1986
Buku Teks SO
Gilmer, B. von Haller (Beverly von Haller), 1909-1994
McGraw-Hill, 1966
Buku Teks SO