1
Published 2011
National Academies Press (US)

3
by Hauff, Michael von
Published 2018
Nomos Verlagsgesellschaft mbH & Co. KG

4
Published 2010
National Academies Press

7
Published 2013
Foro Consultivo Científico y Tecnológico. A.C.

8
Published 2017
OECD Publishing

10
Published 2015
Korean Research Institute for Vocational Education & Training

12
Published 2017
OECD Publishing

15
Published 2017
OECD Publishing

17
by Demmou, Lilas
Published 2015
OECD Publishing

19
Published 2010
OECD Publishing

20
Published 2011
OECD Publishing