Altmann, Jurgen, author
Routledge, 2006
Buku Teks
Preston, Richard Arthur, author
Praeger, 1962
Buku Teks
Ferrari, Paul L.
Ballinger Publishing Company, 1988
Buku Teks
Emmerson, John K., author
Charles E. Tuttle Company, 1976
Buku Teks
Timperlake, Edward
Regnery Publishing, 1999
Buku Teks