edited by Edwin A. Fleishman
Dorsey Press, 1967
Buku Teks
Maier, Norman R.F.
Hougtton-Mifflin, 1965
Buku Teks
Maier, Norman R.F.
John Wiley & Sons, 1956
Buku Teks
McCormick, Ernest James
Prentice-Hall, 1984
Buku Teks
Wexley, Kenneth N.
Irwin, 1984
Buku Referensi