ABC of Asthma, 6th Edition, (John Rees, Dipak Kanabar, Shriti Pattani), ISBN: 978-1-118-69999-7, May 2013, BMJ Books, Also available online)
 
The Respiratory System at a Glance, 4th Edition, (Jeremy P. T. Ward, Jane Ward, Richard M. Leach), August 2015, ©2015, Wiley-Blackwell
 
Any good medical textbook e.g. Davidson's Principles and Practice of Medicine 23rd Edition