Smith, Susan M; Schroeder, Knut; Fahey, Tom; Smith, Susan M (2014). “Over-the-counter (OTC) medications for acute cough in children and adults in community settings”. Cochrane Database Syst Re: CD001831. doi:10.1002/14651858.CD001831.pub5. PMID25420096.
Smith, Susan M; Schroeder, Knut; Fahey, Tom; Smith, Susan M (2014). “Over-the-counter (OTC) medications for acute cough in children and adults in community settings”. Cochrane Database Syst Re: CD001831. doi:10.1002/14651858.CD001831.pub5. PMID25420096.