@unpublished{repository1991,
            note = {Unpublished},
       publisher = {Universitas Muhammadiyah Prof. Dr. Hamka},
           title = {Modul Praktikum Biokimia},
             url = {http://repository.uhamka.ac.id/id/eprint/1991/},
          author = {Rachmania, Rizky Arcinthya}
}