http://www.worldatlas.com/articles/the-10-smallest-countries-in-the-world.html
http://www.worldatlas.com/articles/least-populated-country-in-the-world.html
https://themysteriousworld.com/10-smallest-countries-on-earth/
http://www.history.com/news/10-things-you-may-not-know-about-the-vatican
https://en.wikipedia.org/wiki/Monaco
http://monaco.me/monaco/about-monaco/
http://www.bbc.com/news/world-asia-pacific-15433616
http://thefactfile.org/interesting-facts-nauru/
http://mentalfloss.com/article/69736/13-fascinating-little-facts-about-liechtenstein
http://www.bbc.com/news/world-europe-17846374
http://www.telegraph.co.uk/travel/st-kitts-holidays/ten-interesting-facts/
https://en.wikipedia.org/wiki/Principality_of_Sealand
http://sometimes-interesting.com/2011/07/05/the-smallest-country-in-the-world-sealand/
http://mentalfloss.com/article/64964/5-facts-about-pitcairn-island
https://en.wikipedia.org/wiki/Pitcairn_Islands
http://brilliantmaps.com/saint-martin/
http://www.bbc.com/news/world-south-asia-12651486
http://www.foxnews.com/story/2007/01/08/world-smallest-country-for-sale.html