Widiastoeti, H., and Maulidah Narastri. “Improvement of Internal Control Through Operational Standards for Procedures for Procurement of The Equipment and Services at ’D’ Type Hospital in Sumenep District”. Enrichment : Journal of Management, Vol. 11, no. 2, Apr. 2021, pp. 373-7, doi:10.35335/enrichment.v11i2.108.