Wolf, Thomas
Prentice Hall Press, 1990
Buku Teks
Mutiara, author
Fakultas Teknik Universitas Indonesia, 2022
UI - Tesis (Membership)
Barbeito, Carol L.
John wiley & sons, inc, 2004
Buku Teks
Kotler, Philip, author
Prentice-Hall, 1995
Buku Teks
Shim, Jae K.
Prentice-Hall, 1996
Buku Referensi