1. www.redcrossblood.org/about-us
2. http://www.nobelprize.org/educational/medicine/landsteiner/readmore.html
3. http://www.redcrossblood.org/learn-about-blood/blood-types
4. Blood Compatibility Image
5. http://learn.genetics.utah.edu/content/begin/traits/blood/
6. http://www.openzine.com/aspx/ReadMore.aspx?lid=77&zineID=0&divid=307&ID=11217&IssueID=2836
2. http://www.nobelprize.org/educational/medicine/landsteiner/readmore.html
3. http://www.redcrossblood.org/learn-about-blood/blood-types
4. Blood Compatibility Image
5. http://learn.genetics.utah.edu/content/begin/traits/blood/
6. http://www.openzine.com/aspx/ReadMore.aspx?lid=77&zineID=0&divid=307&ID=11217&IssueID=2836