Schaberg, Marc
Edward Elgar , 1999
Buku Teks
Meyer, Paul A.
Richard D. Irwin, Inc., 1982
Buku Teks
edited by Kevin Dowd and Mervyn K. Lewis
Macmillan, 1992
Buku Teks
Horvitz, Paul M.
Prentice-Hall, 1963
Buku Teks
Cencini, Alvaro
Routledge , 1997
Buku Teks