Orthodontics and dentofacial orthopaedics, 1998: title page (edited by John P. Fricker)

OCLC, 7 March 2016 (access points: Fricker, John P.; Fricker, John Petrie; usage: John P. Fricker, John Petrie Fricker)

Le Chevalier, July 2010, viewed 7 March 2016 (Dr. John Peterie Fricker; orthodontist in Canberra; awarded the Medal of the Order of Australia; twin brother of Peter Fricker) http://osjsa.org.au/wp/wp-content/uploads/2014/11/lechevalier-2010_7.pdf

Wikipedia, viewed 7 March 2016 (John Fricker; twin brother of Peter Allen Fricker, born 12 February 1950, Adelaide, South Australia) http://en.wikipedia.org/wiki/Peter_Fricker_%28sports_physician%29

It's an Honour website, viewed 16 March 2016 (John Peterie Fricker; 2010, OAM, for service to dentistry) http://www.itsanhonour.gov.au/honours/honour_roll/search.cfm?aus_award_id=1141948&search_type=advanced&showInd=true