@unpublished{repository52355,
            note = {Unpublished},
           title = {Pengembangan E-book Berbantuan Flipping Book},
       publisher = {Universitas Muhammadiyah Prof.DR.HAMKA},
          author = {Zulherman, Zulherman},
             url = {http://repository.uhamka.ac.id/id/eprint/52355/}
}