http://repository.uhamka.ac.id/id/eprint/15260/ Strategi Promosi Batu Alam di PT. Mulia Sejati Global Jakarta Selatan Niswah, Khiyarotun http://repository.uhamka.ac.id/id/eprint/15260/1/FKIP_PENDIDIKAN%20EKONOMI_1601085040_KHIYAROTUN%20NISWAH.pdf Unduh!