The importance of supporting autonomy and perceived competence in facilitating long-term tobacco abstinence
Annals of Behavioral Medicine (2009) - Comment
pubmed: 19373517  doi: 10.1007/s12160-009-9090-y  issn: 1532-4796  issn: 0883-6612 

Geoffrey C. Williams, Christopher P. Niemiec, Heather Patrick, Richard M. Ryan, Edward L. Deci