@unpublished{repository12884,
       publisher = {Universitas Muhammadiyah Prof.DR.HAMKA},
           title = {RPS Konsep Dasar Bumi Antariksa},
            note = {Unpublished},
          author = {Zulherman, Zulherman},
             url = {http://repository.uhamka.ac.id/id/eprint/12884/}
}