Wallace, Harold R.
South-Western Educational, 1995
Buku Teks
edited by Peter Warr
Panguin Books, 1978
Buku Teks
Gilmer, B. von Haller (Beverly von Haller), 1909-1994, author
McGraw-Hill, 1967
Buku Teks
Auerbach Alan J., author
Brown & Benchmark, 1996
Buku Teks
Hovland, Carl I
Yale University Press , 1966
Buku Teks