Khairina, Elfi, et al. “Potential Analysis of Small and Medium Industries (SMIs) in Lima Puluh Kota Regency, West Sumatra”. Jurnal Perspektif Pembiayaan Dan Pembangunan Daerah, vol. 6, no. 5, May 2019, pp. 583-94, doi:10.22437/ppd.v6i5.6342.