Literatura a zdroje
1. Healey, Jane M.: Leváci a jejich výchova, Portál, Praha, 2002, str. 18
2. www.washingtonpost.com/wp-dyn/content/article/2008/07/03/AR2008070303202.html, staženo 12. 10. 2010
3. https://www.guardian.co.uk/world/2008/oct/24/barack-obama-mccain-white-house-left-handed, staženo 15. 10. 2010
4. https://en.wikipedia.org/wiki/Handedness_of_Presidents_of_the_United_States, staženo 15. 10. 2010