Albrecht-Carrie, Rene, author
Columbia University Press, 1950
Buku Teks
Horricks, Raymond, author
Castello, 1988
Buku Teks
Harding, Bertita
Indianapolis The Bobbs-Merrill, 1937
Buku Teks
Burckhardt, Jacob, author
Doubleday & Company, 1956
Buku Teks
Price, Roger, author
Routledge, 1997
Buku Teks