Ginting, S., I. Firmansyah, D. Putra, D. Aldy, S. Pasaribu, and C. Lubis. “Association Between Socioeconomic Status and the Prevalence of Intestinal Worm Infection in Primary School Children”. Paediatrica Indonesiana, Vol. 44, no. 3, Oct. 2016, pp. 106-10, doi:10.14238/pi44.3.2004.106-10.