1. Ryan R. A double blind clinical evaluation of bromelains in the treatment of acute sinusitis. Headache 1967;7:13-7.
2. Taub SJ. The use of bromelains in sinusitis: a double-blind evaluation. EENT Monthly 1967;46(3):361-5.
3. Seltzer AP. Adjunctive use of bromelains in sinusitis: a controlled study. EENT Monthly 1967;46(10):1281-8.
4. Gaby AR. The story of bromelain. Nutr Healing May 1995:3, 4, 11.
5. Kehrl W, Sonnemann U, Dethlefsen U. Therapy for acute nonpurulent rhinosinusitis with cineole: results of a double-blind, randomized, placebo-controlled trial. Laryngoscope2004;114:738-42.
6. Schulz V, Hansel R, Tyler VE. Rational Phytotherapy, 3rd ed. Berlin, Germany: Springer-Verlag, 1998, 146-7.
7. Kehrl W, Sonnemann U, Dethlefsen U. Therapy for acute nonpurulent rhinosinusitis with cineole: results of a double-blind, randomized, placebo-controlled trial. Laryngoscope2004;114:738-42.
8. Schulz V, Hansel R, Tyler VE. Rational Phytotherapy, 3rd ed. Berlin, Germany: Springer-Verlag, 1998, 146-7.
9. Schulz V, Hänsel R, Tyler VE. Rational Phytotherapy: A Physician's Guide to Herbal Medicine. Berlin: Springer-Verlag, 1998, 163-4.
10. März RW, Ismail C, Popp MA. Action profile and efficacy of a herbal combination preparation for the treatment of sinusitis. Wien Med Wschr 1999;149:202-8.
11. Mills S, Bone K. Principles and Practice of Phytotherapy. London: Churchill Livingstone, 2000, 21.
12. Folweiler DS, Lynch OT. Nasal specific as part of a chiropractic approach to chronic sinusitis and sinus headaches. J Manipulative Physiol Ther 1995;18:38-41.
13. Ogle KA, Bullock JD. Children with allergic rhinitis and/or bronchial asthma treated with elimination diet: a five-year follow-up. Ann Allergy 1980;44:273-8.
14. Rowe AH, Rowe A Jr. Perennial nasal allergy due to food sensitization. J Asthma Res 1965;3:141-54.
15. Derlacki EL. Food sensitization as a cause of perennial nasal allergy. Ann Allergy 1955;13:682-9.
16. Davison HM. The role of food sensitivity in nasal allergy. Ann Allergy 1951;9:568-72.