Strategi marketing public relations pada promosi dalam membangun citra produk (studi kasus strategi marketing public relation pada promosi dalam membangun citra produk 4G LTE oleh PT XL Axiata Tbk) = Marketing public relations strategy on promotion to build product image (a case study marketing public relations strategy on promotion to build product image of 4G LTE by PT XL Axiata Tbk) / Winda Dwi Astuti Zebua