Hidayatulloh, A. R., I. Rosnidah, and J. Romdonny. “The Effect of Product Variation and Sales Service on Customer Loyalty With Customer Satisfaction As A Mediating Variable: Case Study: JEL Classification: M31, L81, D12, C12, C51”. Journal La Bisecoman, Vol. 7, no. 1, Feb. 2026, pp. 87-99, doi:10.37899/journallabisecoman.v7i1.3005.