@unpublished{repository13074,
           title = {Critical review on mathematics virtual classroom
practice in private university},
         journal = {The International Journal of Nonlinear Analysis and Applications (IJNAA)},
            note = {Unpublished},
          author = {Samsul Maarif, SMF},
             url = {http://repository.uhamka.ac.id/id/eprint/13074/}
}