Ali, M., Saputra, I., Adillida, A., Sofyani, S., & Lubis, I. (2016). Knowledge, attitude, and practice of working and non-working mothers concerning immunization of underfive children. Paediatrica Indonesiana, 44(3), 101-5. https://doi.org/10.14238/pi44.3.2004.101-5