Chairy, Ricky dan. 2019. “Pengaruh Product Involvement, Milk Knowledge Dan Perceived Value Terhadap Purchase Intention ( Kasus : Produk Susu Ultramilk)”. Jurnal Manajemen Bisnis Dan Kewirausahaan 3 (1). Jakarta, Indonesia. https://doi.org/10.24912/jmbk.v3i1.4921.