Positive interaction in the elementary school. Hartmann, W. & Rollett, B. 1994.
bibtex   
@Article{hartmann1994,
  Title                    = {Positive interaction in the elementary school},
  Author                   = {W. Hartmann and B. Rollett},
  Year                     = {1994},
  Pages                    = {195-202},
  Booktitle                = {Play and Intervention}
}

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