Wilson, James Q., author
D.C. Helath and Co., 1986
Buku Teks
Fox, Frank W., author
Kendall/Hunt , 1990
Buku Teks
Litwack, Leon, author
Prentice-Hall, 1962
Buku Teks
Adams, Walter, 1922-1998, author
Prentice-Hall, 2001
Buku Teks
Ferguson, John H., author
McGraw-Hill, 1965
Buku Teks