1. https://en.wikipedia.org/wiki/Rugby_football
2. https://d1t6gdblzuqy70.cloudfront.net/content/uploads/2015/08/Rugby_WC.png
3. http://keyassets.timeincuk.net/inspirewp/live/wp-content/uploads/sites/7/2011/07/worldcupball2011.jpg
4. http://www.foxsports.com.au/rugby/us-public-react-hilariously-to-nuts-and-intense-all-blacks-rugby-test/news-story/67b8010dff9b0796da83d30700beea95
5. http://slps.priory.org/fraugustine/RugbySafety.htm
6.https://en.wikipedia.org/wiki/Rugby_union