1. http://www.ncbi.nlm.nih.gov/pubmed/7863342 By the Department of Molecular Genetics, University of London, UK.
2. www.copresco.com/links/colblind.htm By The Copresco Company
3. http://www.sfgate.com/technology/businessinsider/article/10-Things-You-Didn-t-Know-About-Mark-Zuckerberg-2479877.php By Nicholas Carlson
4. http://www.colourblindawareness.org By Kathryn Albany-Ward
5. www.biography.com/people/john-dalton-9265201 Sorry, could not find author :(
2. www.copresco.com/links/colblind.htm By The Copresco Company
3. http://www.sfgate.com/technology/businessinsider/article/10-Things-You-Didn-t-Know-About-Mark-Zuckerberg-2479877.php By Nicholas Carlson
4. http://www.colourblindawareness.org By Kathryn Albany-Ward
5. www.biography.com/people/john-dalton-9265201 Sorry, could not find author :(