McPherson, James M.
Princeton University press, 1977
Buku Teks
Brink, William
Simon and Schuster, 1964
Buku Teks
Lomax, Louis E
Harper & Brothers Publishers, 1962
Buku Teks
Brodie, james Michael
Angkasa, 1993
Buku Teks
Konvitz, Milton R.
Columbia University Press, 1962
Buku Teks