Nettle Daniel Happiness : the science behind your smile Oxford : Oxford University Press : 2006 : 224 s. : ISBN: 0-19-280559-2 (pbk.) Mandatory Search the University Library catalogue
Layard Richard Happiness : lessons from a new science London : Penguin Books : 2006 : 310 s. : ISBN: 0-14-101690-6 Mandatory Search the University Library catalogue