Fortune, Joyce
John Wiley & Sons, 2005
Buku Teks
Fakultas Teknik Universitas Indonesia, 2002
UI - Skripsi (Membership)
Blanchard, Benjamin S.
Prentice-Hall, 1990
Buku Teks
Ossenbruggen, Paul J.
John Wiley & Sons, 1984
Buku Teks
Blanchard, Benjamin S.
Prentice-Hall, 1998
Buku Teks