References:
- http://mentalfloss.com/article/55599/15-delightful-facts-about-saint-patricks-day
- https://www.irishcentral.com/roots/top-ten-facts-you-never-knew-about-st-patricks-day-140846663-237432581
- https://www.popsugar.com/food/St-Patrick-Day-Fun-Facts-176762
- http://www.telegraph.co.uk/news/worldnews/europe/ireland/5005127/St-Patricks-Day-Top-10-facts.html
- http://www.history.com/topics/st-patricks-day/history-of-st-patricks-day
- http://www.softschools.com/facts/holidays/st_patricks_day_facts/151/
- https://lifehacker.com/the-real-history-of-st-patrick-s-day-1793354674
- http://time.com/4261456/st-patrick-day-2016-history-real-saint/