:  Houtmans M M
:  The influence of external rewards and performance feedback on dynamic aspects of task motivation
:  
( ):  Nijmegen
:  1974
:  
:  Houtmans M.J.M. The influence of external rewards and performance feedback on dynamic aspects of task motivation. N.J.: Nijmegen, 1989. 153 p.
:  
:  



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