Bussagli, Mario
Electa/ Rizzoli, 1989
Buku Teks
Evans, Grant, author
Verso, 1984
Buku Teks
Barnett, A. Doak (Arthur Doak), author
Frederick A. Praeger, 1962
Buku Teks
Daniels, Robert V., author
Routledge, 1994
Buku Teks
Lewis, John W., author
Cornell University Press, 1963
Buku Teks