1
by Weiten
Published 2009
2
by Prosser
Published 2010
3
Published 1999
4
Published 1994
5
by Arnold
Published 2010
6
by Marshak
Published 2006
7
by Hoyer
Published 2009
8
by Weiten
Published 2000
9
10
by Carlson
Published 1998
11
by Ong Li Yin
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12
by Li Song
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13
by Devlin
Published 2012
14
by Kolko
Published 2011
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15
by Cascio
Published 2005
16
Published 2008
17
by Levitt
Published 2006
18
by Pausch
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19
by Covey
Published 2004
20
by Chu
Published 2007