3
Published 2015
OECD Publishing

5
by LeBlanc, Jonathan
Published 2016
APN Promise

6
by Hawley, David E.
Published 2012
Helion

7
by Chappell, David
Published 2014
Helion

8
by McCauley, Cynthia D., Fick-Cooper, Lynn
Published 2018
Center for Creative Leadership

10
Published 2018
OECD Publishing

14
Published 2007
Ministry of Economy, Poland

15
Published 2008
Ministry of Economy, Poland

16
Published 2007
Statistics Poland

17
Published 2011
Wolters Kluwer Polska Sp. z o.o., Poland

19
by Grover, Chris
Published 2012
Helion

20
by MacDonald, Matthew
Published 2012
Helion