Sukanya Suwantha. 2009. The differences in degree of print-rich environments between an international school and two Thai schools. Bangkok:Thammasat University;

Sukanya Suwantha. The differences in degree of print-rich environments between an international school and two Thai schools. Bangkok:Thammasat University, 2009.

Sukanya Suwantha. (2009) The differences in degree of print-rich environments between an international school and two Thai schools (รายงานผลงานวิจัย). Thammasat University:Bangkok.