DASOPANG, E. S.; JULIA SARI, T.; MULIANI, W.; HASANAH, F.; NATALIA SIAHAAN, D.; HANDAYANI LUBIS, S. Willingness To Pay And Ability To Pay Child Follow-Up Immunization In Medan City. International Journal of Science, Technology & Management, v. 5, n. 1, p. 74-81, 25 Jan. 2024.