Ismail, D., Paryanto, E., Sadjimin, T. and Soetrisno, R. 1999. Factors affecting the implementation of immunization. Paediatrica Indonesiana. 39, 3-4 (Apr. 1999), 108-15. DOI:https://doi.org/10.14238/pi39.3-4.1999.108-15.