Thompson, June M., author
Westview Press, 1990
Buku Teks
Rauch, Georg von, author
Frederick A. Preager , 1957
Buku Teks
Dallin, David
Hollis & Carter, 1949
Buku Teks
Dallin, David J., author
Yale University Press, 1956
Buku Teks
Channon, John, author
Penguin Books, 1995
Buku Referensi