Romadhoni, Ferry Fahmi. “PENGARUH 4P ( PRODUCT, PRICE, PLACE, PROMOTION ) TERHADAP BRAND SWITCHING PENGGUNA HANDPHONE SAMSUNG ( A STUDY ON IDHOTUN NASYIIN HIGH SCHOOL STUDENTS )”. JEKMA (Jurnal Ekonomi Mahasiswa), vol. 1, no. 1, Jan. 2020, https://jurnalekonomi.unisla.ac.id/index.php/JEKMA/article/view/447.