1
Published 2007
Ministry of Labor and Social Affairs, Spain

2
Published 2009
Santillana, Mexico

3
Published 2008
Ministry of Labor and Social Affairs, Spain

4
Published 2010
Ministry of Health, Spain

5
Published 2004
OECD Publishing

6
Published 2008
Ministry of Labor and Social Affairs, Spain

7
Published 2007
Ministry of Labor and Social Affairs, Spain

8
Published 2010
Universidad Catolica Cardenal Raul Silva Henriquez

9
Published 2005
Fundacion E

10
Published 2009
Ministry of Labor and Social Affairs, Spain

11
Published 2007
Ministry of Labor and Social Affairs, Spain

12
Published 2009
Dirección General de Tráfico

13
Published 2009
Dirección General de Tráfico

14
Published 2010
Instituto Nacional de Administración Pública

15
Published 2008
Ministry of Labor and Social Affairs, Spain

16
by Keeley, Brian
Published 2007
Ediciones Castillo S.A. de C.V.

17
Published 2005
OECD Publishing

19
Published 2015
Inter-American Development Bank

20
Published 2017
OECD Publishing