Torres، Daniele؛ Parrinello، Gaspare؛ Trapanese، Caterina؛ Licata، Giuseppe (2017). "Sudden severe abdominal pain after a single low dose of paracetamol/codein in a cholecystectomized patient: learning from a case report". American Journal of Therapeutics. ج. 17 ع. 4: e133–134. DOI:10.1097/MJT.0b013e3181baf253. ISSN:1536-3686. PMID:19829093.
Sizar، Omeed؛ Gupta، Mohit (2019). "Opioid Induced Constipation". National Center for Biotechnology information. StatPearls Publishing. PMID:29630236. مؤرشف من الأصل في 2023-02-09. اطلع عليه بتاريخ 2019-06-04.
Torres، Daniele؛ Parrinello، Gaspare؛ Trapanese، Caterina؛ Licata، Giuseppe (2017). "Sudden severe abdominal pain after a single low dose of paracetamol/codein in a cholecystectomized patient: learning from a case report". American Journal of Therapeutics. ج. 17 ع. 4: e133–134. DOI:10.1097/MJT.0b013e3181baf253. ISSN:1536-3686. PMID:19829093.
Sizar، Omeed؛ Gupta، Mohit (2019). "Opioid Induced Constipation". National Center for Biotechnology information. StatPearls Publishing. PMID:29630236. مؤرشف من الأصل في 2023-02-09. اطلع عليه بتاريخ 2019-06-04.
Sizar، Omeed؛ Gupta، Mohit (2019). "Opioid Induced Constipation". National Center for Biotechnology information. StatPearls Publishing. PMID:29630236. مؤرشف من الأصل في 2023-02-09. اطلع عليه بتاريخ 2019-06-04.
Torres، Daniele؛ Parrinello، Gaspare؛ Trapanese، Caterina؛ Licata، Giuseppe (2017). "Sudden severe abdominal pain after a single low dose of paracetamol/codein in a cholecystectomized patient: learning from a case report". American Journal of Therapeutics. ج. 17 ع. 4: e133–134. DOI:10.1097/MJT.0b013e3181baf253. ISSN:1536-3686. PMID:19829093.