@unpublished{repository20144,
            note = {Unpublished},
           title = {Stat u P 1A 20221},
       publisher = {S2 Pendidikan Matematika UHAMKA},
          author = {Purwanto, Sigid Edy},
             url = {http://repository.uhamka.ac.id/id/eprint/20144/}
}