@article{WollnyFayUrbach2016,
  author    = {Anna Wollny and Doris Fay and Tina Urbach},
  title     = {Personal initiative in middle childhood: Conceptualization and measurement development},
  journal   = {Learning and individual differences},
  volume    = {49},
  pages     = {59 -- 73},
  doi       = {10.1016/j.lindif.2016.05.004},
  year      = {2016},
}