References

1) https://www.futuredatastats.com/sumo-wrestling-equipment-market#:~:text=Key%20items%20include%20the%20mawashi,where%20the%20matches%20take%20place.

2) https://www.dimensions.com/element/sumo-dohyo-sumo-ring

3) https://deeperjapan.com/sumo-ranking

4) https://www.sumotalk.com/rules.htm

5) https://www.japantimes.co.jp/sports/2019/01/21/sumo/sumo-101-pre-post-bout-rituals/

6) https://www.japan-guide.com/e/e2080.html 

7) https://web-japan.org/kidsweb/virtual/sumo/sumo03.html 

8) https://www.futuredatastats.com/sumo-wrestling-equipment-market?srsltid=AfmBOoq-hs0S1M-9IRTpSCQoP6T5PXFIJP7nuheiDtH_UhwjuiP91tFr 

9) https://www.japantimes.co.jp/sports/2019/03/24/sumo/sumo-101-instant-replay/  

10) https://www.thetimes.com/uk/society/article/amateur-sumo-wrestling-uk-japan-2wr8qhpxz

11) https://socialstudieshelp.com/sumo-wrestling-exploring-japans-sacred-sport-tradition/#:~:text=Sumo%20is%20much%20more%20than,and%20out%20of%20the%20ring