Heijbroek, A.M.A., author
Rabobank International Group , 1996
Buku Teks
PennWell Publishing Co, 1992
Majalah, Jurnal, Buletin
Lubis, Iman, author
2015
UI - Tesis (Membership)
Wiklund, Erik, author
McGraw-Hill , 1987
Buku Teks
Fabozzi, Frank J., author
Prentice-Hall, 1993
Buku Teks