Mumek, L. I. “Pengaruh Product Knowledge Dan Brand Image Terhadap Keputusan Pembelian Produk Loco Gold Di PT Equity World Futures”. Productivity, vol. 3, no. 4, May 2022, pp. 291-6, https://ejournal.unsrat.ac.id/v3/index.php/productivity/article/view/40988.