Schroeder K, Fahey T (2001). "Over-the-counter medications for acute cough in children and adults in ambulatory settings". Cochrane Database Syst Rev (4): CD001831. doi:10.1002/14651858.CD001831. PMID15495019.
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Schroeder K, Fahey T (2001). "Over-the-counter medications for acute cough in children and adults in ambulatory settings". Cochrane Database Syst Rev (4): CD001831. doi:10.1002/14651858.CD001831. PMID15495019.