@unpublished{repository44986,
           title = {SK Mengajar Konsep Dasar Bumi Antariksa},
       publisher = {Universitas Muhammadiyah Prof.DR.HAMKA},
            note = {Unpublished},
          author = {Zulherman, Zulherman},
             url = {http://repository.uhamka.ac.id/id/eprint/44986/}
}