Romadhoni FF. PENGARUH 4P ( PRODUCT, PRICE, PLACE, PROMOTION ) TERHADAP BRAND SWITCHING PENGGUNA HANDPHONE SAMSUNG ( A STUDY ON IDHOTUN NASYIIN HIGH SCHOOL STUDENTS ). jekma [Internet]. 2020 Jan. 1 [cited 2026 Nov. 11];1(1). Available from: https://jurnalekonomi.unisla.ac.id/index.php/JEKMA/article/view/447