Wonpen Kaewpan. 2001. Improving service quality of out-patient department in central region general hospitals. Field of Study Public Health Administration, Mahidol University;

Wonpen Kaewpan. Improving service quality of out-patient department in central region general hospitals. . Bangkok:Mahidol University, 2001.

Wonpen Kaewpan. (2001) Improving service quality of out-patient department in central region general hospitals . Mahidol University/Bangkok.