McPherson, George
Wiley, 1981
Buku Teks
Sackheim, George I., author
Pearson education , 2002
Buku Teks
Orwell, George, 1903-1950, author
Everyman's Library, 1993
Buku Teks
Anderson, John D.
McGraw-Hill, 1985
Buku Teks
Holmes, Lowell D.
The Ronald Press, 1965
Buku Teks