Bismihayati, B., A. Frinaldi, R. Rembrandt, D. Lanin, and G. Umar. “The Impact of Internal-External Factors in Antenatal Care Service on the Effort of Public Health Center in Agam Regency to Accelerate Minimum Service Standard Achievement”. Science and Environmental Journal for Postgraduate, Vol. 5, no. 1, Dec. 2022, pp. 62-70, doi:10.24036/senjop.v5i1.154.