DeMers, Michael N.
John Wiley & Sons, 1997
Buku Teks
Artikel Jurnal
Clarke, Keith C.
Prentice-Hall, 1999
Buku Teks
edited by Xiao Ningchuan
Springer-Verlag, 2012
eBooks
Sardy S., author
Lembaga Penelitian Universitas Indonesia, 1994
UI - Laporan Penelitian