@unpublished{repository29187,
           title = {laporn pengmas 2021},
       publisher = {Universitas Muhammadiyah Prof.DR.HAMKA},
            note = {Unpublished},
             url = {http://repository.uhamka.ac.id/id/eprint/29187/},
          author = {Zulherman, Zulherman}
}