Penchit Ngamnithiporn. 2001. Ambulance service development in Ramathibody hospital. Field of Study Hospital Administration, Mahidol University;
Penchit Ngamnithiporn. (2001) Ambulance service development in Ramathibody hospital . Mahidol University/Bangkok.
Penchit Ngamnithiporn. Ambulance service development in Ramathibody hospital. . Bangkok:Mahidol University, 2001.
Penchit Ngamnithiporn. (2001) Ambulance service development in Ramathibody hospital . Mahidol University/Bangkok.