Pornpen Chatchaisitikul. 2002. Hearing loss among elementary students graed 4-6 in Nakhonnayok province. Field of Study Public Health Nursing, Mahidol University;
Pornpen Chatchaisitikul. (2002) Hearing loss among elementary students graed 4-6 in Nakhonnayok province . Mahidol University/Bangkok.
Pornpen Chatchaisitikul. Hearing loss among elementary students graed 4-6 in Nakhonnayok province. . Bangkok:Mahidol University, 2002.
Pornpen Chatchaisitikul. (2002) Hearing loss among elementary students graed 4-6 in Nakhonnayok province . Mahidol University/Bangkok.