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"About Blood." Give Blood: New England and North Wales. NHS Blood and Transplant. Web. 22 Jan 2013. <http://www.blood.co.uk/about-blood/>
"Why do people have different blood types?." Scientific American. Scientific American. Web. 31 Jan 2013. <http://www.scientificamerican.com/article.cfm?id=why-do-people-have-differ>
"Preparing Yourself to Give Blood." Give Blood: New England & North Wales. NHS: Blood and Transplant. Web. 1 Feb 2013. <http://www.blood.co.uk/giving-blood/prepare/>
"Genes & Blood Type." Genetic Science Learning Center. University of Utah. Web. 1 Feb 2013. <http://learn.genetics.utah.edu/content/begin/traits/blood/>
"Donate Blood: Blood Collection Services."Community Blood Services. Community Blood Services. Web. 1 Feb 2013. <http://www.communitybloodservices.org/os_bloodservices.php>
"African American/Black Community Outreach Program." American Red Cross. American Red Cross. Web. 1 Feb 2013. <http://www.redcrossblood.org/info/pennjersey/african-americanblack-community-outreach-program>
"Asian Community Outreach Program." American Red Cross. American Red Cross. Web. 1 Feb 2013. <http://www.redcrossblood.org/info/pennjersey/asian-community-outreach-program>
"Donating Blood." Teens Health for Nemours. KidsHealth. Web. 1 Feb 2013. <http://kidshealth.org/teen/school_jobs/jobs/donating_blood.html>
Rusenko, David, Chris Fanini, and Dan Veltri. Weebly. Weebly. Web. 1 Feb 2013. <www.weebly.com>
"Blood: What's Your Type?." Heart. The Franklin Institute. Web. 1 Feb 2013. <http://www.fi.edu/learn/heart/blood/types.html>
O'Neill, Dennis. Distribution of Blood Type. N.p.. Web. 1 Feb 2013. <http://anthro.palomar.edu/vary/vary_3.htm>
"The Coordinator's Toolkit | American Red Cross." American Red Cross - Give blood. American Red Cross, n.d. Web. 30 Apr. 2013. <http://www.redcrossblood.org/hosting-blood-drive/coordinators-toolkit>.
"Blood Types | American Red Cross." American Red Cross - Give blood. American Red Cross, n.d. Web. 30 May 2013. <http://www.redcrossblood.org/learn-about-blood/blood-types>.
Watkins, W. M. (2001), The ABO blood group system: historical background. Transfusion Medicine, 11: 243–265. doi: 10.1046/j.1365-3148.2001.00321.x
"ABO Blood Types." Palomar College HUMAN BLOOD: An Introduction to Its Components and Types. Dennis O'Neill, n.d. Web. 2 Apr. 2013. <anthro.palomar.edu/blood/ABO_system.htm>.
"About Blood." Give Blood: New England and North Wales. NHS Blood and Transplant. Web. 22 Jan 2013. <http://www.blood.co.uk/about-blood/>
"Why do people have different blood types?." Scientific American. Scientific American. Web. 31 Jan 2013. <http://www.scientificamerican.com/article.cfm?id=why-do-people-have-differ>
"Preparing Yourself to Give Blood." Give Blood: New England & North Wales. NHS: Blood and Transplant. Web. 1 Feb 2013. <http://www.blood.co.uk/giving-blood/prepare/>
"Genes & Blood Type." Genetic Science Learning Center. University of Utah. Web. 1 Feb 2013. <http://learn.genetics.utah.edu/content/begin/traits/blood/>
"Donate Blood: Blood Collection Services."Community Blood Services. Community Blood Services. Web. 1 Feb 2013. <http://www.communitybloodservices.org/os_bloodservices.php>
"African American/Black Community Outreach Program." American Red Cross. American Red Cross. Web. 1 Feb 2013. <http://www.redcrossblood.org/info/pennjersey/african-americanblack-community-outreach-program>
"Asian Community Outreach Program." American Red Cross. American Red Cross. Web. 1 Feb 2013. <http://www.redcrossblood.org/info/pennjersey/asian-community-outreach-program>
"Donating Blood." Teens Health for Nemours. KidsHealth. Web. 1 Feb 2013. <http://kidshealth.org/teen/school_jobs/jobs/donating_blood.html>
Rusenko, David, Chris Fanini, and Dan Veltri. Weebly. Weebly. Web. 1 Feb 2013. <www.weebly.com>
"Blood: What's Your Type?." Heart. The Franklin Institute. Web. 1 Feb 2013. <http://www.fi.edu/learn/heart/blood/types.html>
O'Neill, Dennis. Distribution of Blood Type. N.p.. Web. 1 Feb 2013. <http://anthro.palomar.edu/vary/vary_3.htm>
"The Coordinator's Toolkit | American Red Cross." American Red Cross - Give blood. American Red Cross, n.d. Web. 30 Apr. 2013. <http://www.redcrossblood.org/hosting-blood-drive/coordinators-toolkit>.
"Blood Types | American Red Cross." American Red Cross - Give blood. American Red Cross, n.d. Web. 30 May 2013. <http://www.redcrossblood.org/learn-about-blood/blood-types>.
Watkins, W. M. (2001), The ABO blood group system: historical background. Transfusion Medicine, 11: 243–265. doi: 10.1046/j.1365-3148.2001.00321.x
"ABO Blood Types." Palomar College HUMAN BLOOD: An Introduction to Its Components and Types. Dennis O'Neill, n.d. Web. 2 Apr. 2013. <anthro.palomar.edu/blood/ABO_system.htm>.