Matondang, C. “Spectrum of Asthma in Child En Visiting the Outpatient Clinic of the Subdivision of Allergy and Immunology”. Paediatrica Indonesiana, Vol. 31, no. 5-6, June 2019, pp. 150-64, https://paediatricaindonesiana.org/index.php/paediatrica-indonesiana/article/view/2212.