[http://www.bus.umich.edu/Positive/PDF/fredrickson.pdf}Fredrickson, B. (2003)
The value of positive emotions
American Scientist, July-August: 330-335.
[http://www.bus.umich.edu/Positive/PDF/fredrickson.pdf}Fredrickson, B. (2003)
The value of positive emotions
American Scientist, July-August: 330-335.