<http://www.sjm.com/assets/popups/pacemaker.gif>
<http://upload.wikimedia.org/wikipedia/commons/thumb/c/cf/Flag_of_Canada.svg/800px-Flag_of_Canada.svg.png>
<http://observador.weblog.com.pt/arquivo/american-flag.jpg>
<http://cag-www.lcs.mit.edu/~anne/inventors/WG/WG2-big.jpg>
<http://www.babyfm.com/images/products/rs.jpg>
<http://www.erieniagarape.org/images/2001-02%20awards%20banquet/1greatbatch26.JPG>
<http://www.heartandcoeur.com/images/Hopps.jpg>
<http://www.murdermysterycanada.com/images/Winnipeg%20Skyline.jpg>
<http://www.aacsb.edu/members/b-schools/442.jpg>
<http://www.vmzinc-us.com/images/Portfolio/University_of_Toronto/Toronto_University1.jpg>
<http://www.zoll.com/uploadedImages/Products/Earlier_ZOLL_Defibrillators/NTP.jpg>
<http://www.ficcdat.ca/PortalImages/Image/Cmbclogo%20extra%20good.bmp>
<http://www.sciencetech.technomuses.ca/english/about/hallfame/graphics/Hopps_w150_h185.jpg>
<http://www.cscp.utoronto.ca/gifs/bigelo1_sm.jpg>
<http://www.nrc-cnrc.gc.ca/education/images/science/photos/hopps-sitting.jpg>
<http://www.archives.gov/publications/images/world-war-2-cadets.gif>
<http://www.fs.fed.us/gpnf/recreation/winter/local/images/hypothermia.gif>
<http://www.rootsweb.com/~usgenweb/va/vastones/frederick/mthebron/KigerWG.jpg>
<http://academic.evergreen.edu/l/lavie19/project02/images/single.jpg>

References:  <http://en.wikipedia.org/wiki/Hopps%2C_John_A>.

<http://en.wikipedia.org/wiki/Wilfred_Bigelow>

<http://web.mit.edu/invent/iow/greatbatch.html>

American Heart Association  [AHA] (2007). Pacemakers. Retreived on March 1, 2007 from http://www.americanheart.org/presenter.jhtml?identifier=4676

CBC archive(2006) First pacemaker implanted in human. Retrive on March 1, 2007 from http://archives.cbc.ca/IDC-1-75-942-5469-10/on_this_day/science_technology/pacemaker_implanted.

Pacemaker (2007) Retrieved on March 1, 2007 from http://www.cardiologychannel.com/pacemaker/

Medicine Net. 1996. Pacemaker, Retrieved on March 1 2007 from http://www.medicinenet.com/pacemaker/article.htm

http://heart-disease.health-cares.net/pacemaker.php  (health-care, 2006)

http://hrspatients.org/patients/treatments/pacemakers.asp (pacemakers, 2002)