Edward Elgar, 2003
Buku Teks
Crawford, William R., author
Frederick A. Praeger, 1961
Buku Teks
edited by Eduardo P. Archetti
MacMillan Education, 1987
Buku Teks
Clagett, Helen L.
Oceana Publications, 1952
Buku Teks
Burns, E. Bradford, author
Prentice-Hall, 1977
Buku Teks