Herwanto, H. “PENGARUH KUALITAS PRODUK, HARGA, DAN PROMOSI TERHADAP KEPUTUSAN PEMBELIAN BISKUIT MEREK OREO DI KOTA PEKANBARU”. Indonesian Journal of Economy and Education Economy, vol. 2, no. 1, Mar. 2024, pp. 250-63, https://jurnal.academiacenter.org/index.php/IJEN/article/view/279.