Guo, R; Canter, PH; Ernst, E (2006). "Herbal medicines for the treatment of rhinosinusitis: A systematic review". Otolaryngology--head and neck surgery : official journal of American Academy of Otolaryngology-Head and Neck Surgery. 135 (4): 496–506. doi:10.1016/j.otohns.2006.06.1254. PMID17011407.
Guo, R; Canter, PH; Ernst, E (2006). "Herbal medicines for the treatment of rhinosinusitis: A systematic review". Otolaryngology--head and neck surgery : official journal of American Academy of Otolaryngology-Head and Neck Surgery. 135 (4): 496–506. doi:10.1016/j.otohns.2006.06.1254. PMID17011407.