Ellis, John, 1952-
Routledge, 1994
Buku Teks
Baliio, Tino
Macmillan Library reference USA, 1993
Buku Referensi
Abramson, Albert
McFarlan, 2003
Buku Teks
Burns, Russell W.
Institution of Engineering and Technology, 2008
eBooks
Webb, Richard C.
Wiley-Intercsinece, 2005
Buku Teks