APA
Pringle A. M., Petrie A., Cunningham S. J. & McKnight M. (20090817). Prospective randomized clinical trial to compare pain levels associated with 2 orthodontic fixed bracket systems. : American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.
Chicago
Pringle Angus M, Petrie Aviva, Cunningham Susan J and McKnight Mary. 20090817. Prospective randomized clinical trial to compare pain levels associated with 2 orthodontic fixed bracket systems. : American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.
Harvard
Pringle A. M., Petrie A., Cunningham S. J. and McKnight M. (20090817). Prospective randomized clinical trial to compare pain levels associated with 2 orthodontic fixed bracket systems. : American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.
MLA
Pringle Angus M, Petrie Aviva, Cunningham Susan J and McKnight Mary. Prospective randomized clinical trial to compare pain levels associated with 2 orthodontic fixed bracket systems. : American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics. 20090817.