@unpublished{repository13899,
           title = {Turnitin Critical review on mathematics virtual classroom},
            note = {Unpublished},
       publisher = {UHAMKA},
          author = {Maarif, Samsul and Umam, Khoerul and Soebagyo, Joko and Pradipta, Trisna Roy Pradipta},
             url = {http://repository.uhamka.ac.id/id/eprint/13899/}
}