Poerwanto, Ignatius Adi. “An Infant With Severe Pertussis: Case Report and Literature Review”. Medica Hospitalia : Journal of Clinical Medicine 1, no. 1 (February 8, 2013). Accessed January 8, 2025. http://medicahospitalia.rskariadi.co.id:8080/medicahospitalia/index.php/mh/article/view/43.