Kamerschen, David R.
South-Western Publishing, 1992
Buku Teks
Hart, Albert Gailord, 1909-
Prentice-Hall, 1961
Buku Teks
Auerbach, Robert D.
Macmillan, 1989
Buku Teks
Miller, Roger LeRoy
McGrow-Hill, 1985
Buku Teks
Burstein, N. L.
Massachusetts Schenkman Publication , 1963
Buku Teks