@article{Ryan2000,
author = {Ryan, R.M. and Deci, E.L.},
title= {Self-determination theory and facililation of intrinsic motivation, social development, and well-being},
year = {2000},
doi = {10.1037/0003-066X.55.1.68},
volume = {55},
number = {1},
pages = {68--78},
}