Aphornpirom Ketupunya. 1995. Amnifiltration in early amniocentesis for cytogenetic evaluation : randomized clinical trial. Bangkok:Chulalongkorn University;
Aphornpirom Ketupunya. (1995) Amnifiltration in early amniocentesis for cytogenetic evaluation : randomized clinical trial (รายงานผลงานวิจัย). Chulalongkorn University:Bangkok.
Aphornpirom Ketupunya. Amnifiltration in early amniocentesis for cytogenetic evaluation : randomized clinical trial. Bangkok:Chulalongkorn University, 1995.
Aphornpirom Ketupunya. (1995) Amnifiltration in early amniocentesis for cytogenetic evaluation : randomized clinical trial (รายงานผลงานวิจัย). Chulalongkorn University:Bangkok.