@unpublished{repository45587,
           title = {Statement Letter Resource Person},
       publisher = {Universitas Muhammadiyah Prof. Dr. Hamka},
            note = {Unpublished},
          author = {Dewi, Trie Utari and Hikmat, Ade and Sukardi, Sukardi},
             url = {http://repository.uhamka.ac.id/id/eprint/45587/}
}