De Vries, Mary Ann, author
Prentice-Hall, 1995
Buku Referensi
edited by Marianne Chalmers and Martine Pierquin
Oxford University Press, 2002
Buku Referensi
Adam, J.H., author
York Press, 1989
Buku Referensi
Gastineau, Gary L., author
Frank J. Fabozzi Associates, 1996
Buku Referensi
Finch, Frank, author
Fac On File Publications, 1985
Buku Referensi