Akbar, K., R. Daulay, H. Lubis, Z. Siregar, G. Panggabean, and N. Nuraida. “Tuberculine Test in Infants and Children Who Have Contact to Sputum Positive Adult Pulmonary Tuberculosis Patients”. Paediatrica Indonesiana, Vol. 39, no. 7-8, Aug. 1999, pp. 221-8, doi:10.14238/pi39.7-8.1999.221-8.