http://www.cbc.ca/sports/indepth/drugs/glossary/classes.html
http://www.teachpe.com/drugs/narcotics.php
http://www.medicalnewstoday.com/articles/173068.php
http://gamechangerindia.com/the-anti-doping-monitor/gamechanger-anti-doping-education-series-understanding-the-prohibited-list
http://www.mayoclinic.com/health/beta-blockers/HI00059
http://www.doping-prevention.sp.tum.de/es/substances-and-methods/beta-blockers/beta-blockers.html
http://forum.slowtwitch.com/cgi-bin/gforum.cgi?post=61719
http://www.livestrong.com/article/368336-beta-blockers-used-in-sports/
http://www.wada-ama.org/en/Footer-Links/Search/?quicksearchquery=beta+blockers
http://www.wada-ama.org/
http://elcomercio.pe/deportes/639448/noticia-ines-melchor-fue-suspendida-ano-dar-positivo-dopaje
http://edition.cnn.com/
http://www.teachpe.com/drugs/narcotics.php
http://www.medicalnewstoday.com/articles/173068.php
http://gamechangerindia.com/the-anti-doping-monitor/gamechanger-anti-doping-education-series-understanding-the-prohibited-list
http://www.mayoclinic.com/health/beta-blockers/HI00059
http://www.doping-prevention.sp.tum.de/es/substances-and-methods/beta-blockers/beta-blockers.html
http://forum.slowtwitch.com/cgi-bin/gforum.cgi?post=61719
http://www.livestrong.com/article/368336-beta-blockers-used-in-sports/
http://www.wada-ama.org/en/Footer-Links/Search/?quicksearchquery=beta+blockers
http://www.wada-ama.org/
http://elcomercio.pe/deportes/639448/noticia-ines-melchor-fue-suspendida-ano-dar-positivo-dopaje
http://edition.cnn.com/