Yanti, F., M. Ali, R. Daulay, W. Dalimunthe, and R. Daulay. “Decreased Peak Expiratory Flow in Pediatric Passive Smokers”. Paediatrica Indonesiana, Vol. 51, no. 4, Aug. 2011, pp. 198-01, doi:10.14238/pi51.4.2011.198-201.