^ abcd"Omeprazole". The American Society of Health-System Pharmacists. Diakses tanggal Nov 20, 2016.
^Fedorowicz, Z; van Zuuren, EJ; Hu, N (14 March 2012). "Histamine H2-receptor antagonists for urticaria". The Cochrane database of systematic reviews. 3: CD008596. doi:10.1002/14651858.CD008596.pub2. PMID22419335.