@article{
  author = {Ghaffari, Saeed, najafi, mahtab},
  title = {Investigating the using rate of Persian printed Journals by post graduate students of Islamic Azad University of Qazvin},
  journal = {Journal of Knowledge Studies},
  year = {2013},
  volume = {6},
  number = {21},
  pages = {77-92},
  doi = {}
}