Penchit Ngernprasertsri. 1990. The study of measles antibody levels in Thai children. Bangkok:Mahidol University;
Penchit Ngernprasertsri. (1990) The study of measles antibody levels in Thai children (รายงานผลงานวิจัย). Mahidol University:Bangkok.
Penchit Ngernprasertsri. The study of measles antibody levels in Thai children. Bangkok:Mahidol University, 1990.
Penchit Ngernprasertsri. (1990) The study of measles antibody levels in Thai children (รายงานผลงานวิจัย). Mahidol University:Bangkok.