1. ^{{Cite web|url=http://data.fis-ski.com/dynamic/athlete-biography.html?sector=SB&competitorid=113560&type=result|title=PIIROINEN Petja – Results|website=International Ski Federation (FIS)|access-date=2016-05-17}}
2. ^{{cite web|url=http://www.hs.fi/english/article/Snowboarder+Petja+Piiroinen%E2%80%99s+future+dreams+include+Olympic+victory+and+a+career+as+a+painter-decorator/1135265170307|title=Snowboarder Petja Piiroinen’s future dreams include Olympic victory and a career as a painter-decorator|date=2 April 2011|website=Helsingin Sanomat|archive-url=https://web.archive.org/web/20110410041410/http://www.hs.fi/english/article/Snowboarder+Petja+Piiroinen%E2%80%99s+future+dreams+include+Olympic+victory+and+a+career+as+a+painter-decorator/1135265170307|archive-date=2011-04-10|last1=Rask|first1=Anne|accessdate=31 March 2014|deadurl=yes|df=}}