Ruxporn Thangteekaraks. และ Wachira Wongtanasarasin. (2021) Absence of Imaging Signs in Perforated Peptic Ulcer: A Case Report. P.A. LIVING CO. LTD.:ม.ป.ท.Ruxporn Thangteekaraks. และ Wachira Wongtanasarasin. 2021. Absence of Imaging Signs in Perforated Peptic Ulcer: A Case Report. ม.ป.ท.:P.A. LIVING CO. LTD.;Ruxporn Thangteekaraks. และ Wachira Wongtanasarasin. Absence of Imaging Signs in Perforated Peptic Ulcer: A Case Report. ม.ป.ท.:P.A. LIVING CO. LTD. 2021. Print.