When the going gets tough, the differentiated keep going: cybernetic self-determination, daily obstacles, and persistent goal pursuit
The Journal of Psychology (2015) - Comment
pubmed: 25975572  doi: 10.1080/00223980.2013.837022  issn: 0022-3980  issn: 1940-1019 

Sara K. Moeller, Wendy Troop-Gordon, Michael D. Robinson