References:
- http://www.history.com/news/10-things-you-may-not-know-about-abraham-lincoln
- http://blog.constitutioncenter.org/2014/02/50-shades-of-abraham-lincoln-2/
- https://www.whitehouse.gov/1600/first-ladies/marylincoln
- http://www.ibtimes.com/abraham-lincoln-facts-trivia-17-interesting-things-about-president-his-birthday-2302267
- https://www.yahoo.com/news/10-interesting-facts-abraham-lincoln-assassination-100206552.html
- http://www.republicanpresidents.net/10-interesting-facts-about-abraham-lincoln/
- https://en.wikipedia.org/wiki/Abraham_Lincoln