@unpublished{repository22906,
            note = {Unpublished},
       publisher = {Universitas Muhammadiyah Prof.Dr.Hamka},
           title = {10. Turnitin\_2019\_Rahmi\_2019\_IOP\_Conf.\_Ser.\_\_Earth\_Environ.\_Sci.\_217\_012036},
             url = {http://repository.uhamka.ac.id/id/eprint/22906/},
          author = {Widayanti, Ari}
}