Routledge, 1996
Buku Teks
Ellis, John, 1952-, author
Routledge, 1994
Buku Teks
Baliio, Tino, author
Macmillan Library reference USA, 1993
Buku Referensi
Abramson, Albert, author
McFarlan, 2003
Buku Teks
Burns, Russell W., author
Institution of Engineering and Technology, 2008
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