Buckley, John
Institution of Engineering and Technology, 2009
eBooks
Buckley, John
The Institution of Electrical Engineers, 2003
Buku Teks SO
edited by Ian Walden.
Oxford University Press, 2012
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Gross, Lynne S.
WCB , 1989
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Brown, John, 1923-
English Language Book Society , 1974
Buku Teks SO