2
Published 1999
National Academy Press

3
Published 2014
National Academies Press

4
by Parkkinen, Veli-Pekka
Published 2018
Springer Open

5
Published 2010
British Psychological Society

6
by Bush, David E.
Published 2005
Agency for Healthcare Research and Quality

7
Published 2012
The British Psychological Society and The Royal College of Psychiatrists