Kurniawan, G., and M. Atinaja. “The Effect of Innovative Product, Brand Image, and Opinion Leader on Customer Retention in the Covid-19 Pandemic Era”. JPBM (Jurnal Pendidikan Bisnis Dan Manajemen), vol. 10, no. 3, Nov. 2024, pp. 329-44, doi:10.17977/um003v10i22024p329.