@unpublished{repository3498,
       publisher = {Universitas Muhammadiyah Prof. Dr. HAMKA},
           title = {TRIBOLOGI DAN PERAWATAN 4B},
            note = {Unpublished},
          author = {Mugisidi, Dan},
             url = {http://repository.uhamka.ac.id/id/eprint/3498/}
}