Callahan, Mike, author
McGraw-Hill, 1990
Buku Teks
Ratno Dewo, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2008
UI - Tesis (Open)
Howard, Jenna, author
Pearson Education , 1994
Buku Teks
Head, Robert V., author
Wiley-Interscience, 1971
Buku Referensi
Iwan Ariawan, author
Elex Media Komputindo, 1992
Buku Teks