@article{
  author = {رنجدوست, شهرام},
  title = {Studying the Utilization of Constructivism Theory and Problem Solving Method in the Development of Guidance School Science Text Books},
  journal = {Research in Curriculum Planning},
  year = {2011},
  volume = {8},
  number = {30},
  pages = {11-27},
  doi = {}
}