1. Levison ME, Bush LM. Intra-Abdominal Infection. Mandell, Douglas and Bennett's Principles and Practice of Infectious Disease, 7th edition. Section F; Chapter 71:1011.
2. Liles WC, Dellinger EP. Infectious diseases; The Clinician's Guide to Diagnosis, Treatment and Prevention online version. Sept 2009; Infectious syndromes: chapter on Intra-Abdominal abscesses.
3. Do opiates affect the clinical evaluation of patients with acute abdominal pain?;Ranji;JAMA,2006
4. Evaluation of acute abdominal pain in adults;Cartwright;Am Fam Physician,2008
5. Diagnosis of acute abdominal pain in older patients;Lyon;Am Fam Physician,2006