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Morice, AH (2004). "Post-nasal drip syndrome--a symptom to be sniffed at?". Pulmonary Pharmacology & Therapeutics. 17 (6): 343–5. doi:10.1016/j.pupt.2004.09.005. PMID15564073.
Rosenberg, M (1996). "Clinical assessment of bad breath: current concepts". Journal of the American Dental Association. 127 (4): 475–82. doi:10.14219/jada.archive.1996.0239. PMID8655868.