Reference:
1. Traub G. Natural treatments for coughs, colds and flu [Online]. San Diego: 2006. Available from: http://www.sandiegohomeopathy.com/downloads/CoughsColdsFlu.pdf
2. Blue cross blue shield of Nebraska. Common conditions [Online]. Omaha: Wellness councils of America; 2005. Available from: http://wellness.unl.edu/pdf/KnowNumbers/Colds%20and%20Flu,%20Sore%20Throat,%20Coughs,%20Fever,%20Nausea%20%26%20Vomiting.pdf
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