APA (7th ed.) Citation

Alan Purcell. (2013). Personal observations over a period of about three years of air blowers used to 'clean' school buildings. Elsevier.

Chicago Style (17th ed.) Citation

Alan Purcell. Personal Observations over a Period of About Three Years of Air Blowers Used to 'Clean' School Buildings. Elsevier, 2013.

MLA (9th ed.) Citation

Alan Purcell. Personal Observations over a Period of About Three Years of Air Blowers Used to 'Clean' School Buildings. Elsevier, 2013.

Warning: These citations may not always be 100% accurate.