4
5
by Paley, Norton.
Published 2007
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Electronic eBook
17
by Levinson, Jay Conrad.
Published 2011
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18
by Weingand, Darlene E.
Published 1999
Book
20
Published 2002
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21
by Nykiel, Ronald A.
Published 2003
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22
by McDonald, Malcolm.
Published 2002
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25
Published 2006
Conference Proceeding Book