Piyanan Srisawad. 2009. The perceptions and opinions of Yooyenwitthaya School grade 6 parents about ordinary national educational testing (O-NET). , Thammasat University;
Piyanan Srisawad. (2009) The perceptions and opinions of Yooyenwitthaya School grade 6 parents about ordinary national educational testing (O-NET) . Thammasat University/Bangkok.
Piyanan Srisawad. The perceptions and opinions of Yooyenwitthaya School grade 6 parents about ordinary national educational testing (O-NET). . Bangkok:Thammasat University, 2009.
Piyanan Srisawad. (2009) The perceptions and opinions of Yooyenwitthaya School grade 6 parents about ordinary national educational testing (O-NET) . Thammasat University/Bangkok.