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