Timperlake, Edward
Regnery Publishing, 1999
Buku Teks
Jowett, Philip, author
Osprey Pub Co., 2013
Buku Teks
Reinhardt, George C.
Dobleday, 1960
Buku Teks
Smedley, Agnes, author
The Vanguars Press, 1934
Buku Teks
Banfield, Edward C., author
Free Press, 1965
Buku Teks