D. James/Peter Studdy: A colour atlas of respiratory diseases. Wolfe. 0-7234-1695-8. Pds. 65. Barry Kay/K. Frank Austen/Lawrence Lichtenstein (ed.): Asthma: Physiology, immunopharmacology, and treatment. Academic Press 1984. D. Raeburn/M. Giembycz: Rhinitis. Immunopathology and pharmacotherapy. Birkha''user 1997. 3-7643-5301-5. Robert Stockley: Pulmonary defences. Wiley 1997. 0-471-97000-X.