@ARTICLE{Witkowski_Tomasz_Letters_2013, author={Witkowski, Tomasz and Luszczynska, Aleksandra}, number={No 4}, journal={Polish Psychological Bulletin}, howpublished={online}, year={2013}, publisher={Committee for Psychological Science PAS}, title={Letters to Editor}, URL={http://ochroma.man.poznan.pl/Content/99775/PDF/11.pdf}, doi={10.2478/ppb-2013-0049}, }