Parish, Matthew, author
Edward Elgar, 2011
Buku Teks
Garner, Bryan A., author
The University of Chicago Press, 2001
Buku Teks
The Foundation Press,Inc., 1973
Buku Teks
William J.Devey
St.Paul,Minn., 1995
Buku Teks
Jackson, John H., author
St.Paul,Minn., 1995
Buku Teks