Sirait, R. E. S., A. M. Siahaan, P. R. Sitorus, and L. L. Gultom. “The Effect of Product Quality, Product Innovation, Capital and Marketing Strategy on the Development of MSMEs in Simalungun Regency Trade”. International Journal of Economics Development Research (IJEDR), vol. 6, no. 4, June 2025, pp. 1833-46, doi:10.37385/ijedr.v6i4.8424.