7
Published 2011
Wolters Kluwer Polska Sp. z o.o., Poland

8
Published 2007
Statistics Poland

9
Published 2007
Ministry of Economy, Poland

10
Published 2008
Ministry of Economy, Poland

11
Published 2007
Ministry of Economy, Poland

13
Published 2014
Ministry of Economy, Poland

15
Published 2015
OECD Publishing

16
Published 2015
Ministry of Labour and Social Policy, Poland

17
Published 2012
Ministry of Economy, Poland

20
Published 2018
OECD Publishing