Nugraha, A. Y., and N. I. K. Wardani. “The Effect of Product Differentiation and Electronic Word of Mouth (E-Wom) on Consumer Purchasing Decisions of the Richeese Factory in Surabaya City”. Indonesian Journal of Business Analytics, vol. 3, no. 4, Aug. 2023, pp. 967-80, doi:10.55927/ijba.v3i4.5068.