Edward Elgar, 2003
Buku Teks
edited by Clark W. Bullard and Porter J. Womeldorff
Pergamon, 1984
Buku Teks
Smith, Karl J., author
Brooks/Cole, 1994
Buku Teks
Ian Chandra K., author
Elex Media Komputindo, 1990
Buku Teks
Fishburn, Peter C., author
John Wiley & Sons, 1970
Buku Teks