References:
- http://www.10-facts-about.com/volleyball/id/67
- https://www.volleywood.net/volleyball-features/vw-specials/volleyball-guinness-world-records/
- https://www.gettyimages.com.au/detail/news-photo/todd-rogers-goes-up-for-a-kill-in-avp-huntington-beach-open-news-photo/119027797
- https://www.guinnessworldrecords.com/world-records/longest-marathon-playing-volleyball-(indoors)
- https://springfieldcollege.contentdm.oclc.org/digital/collection/p15370coll2/id/2547/
- http://www.fivb.org/EN/BeachVolleyball/BVPress_Kit/Competitions/WorldTour/2006/beach_page.asp?TRN=WSHA2006&PG=PRE&No=10164
- https://www.fivb.org/TheGame/TheGame_VolleyballOlympicGames.htm
- https://www.volleyball1on1.com/mintonette-and-the-history-of-volley-ball-in-the-usa-and-globally/
- https://www.guinnessworldrecords.com/world-records/most-national-volleyball-championships
- https://www.therichest.com/sports-entertainment/richest-volleyball-players/
- https://instavolley.com/top-10-highest-paid-male-volleyball-players-in-the-world-2017/
- http://www.volleywood.net/volleyball-related-news/volleyball-news-asia/thailand-volleyball-news-asia/meet-the-worlds-tallest-volleyball-player/
- https://protips.dickssportinggoods.com/sports-and-activities/volleyball-101-volleyball-positions-and-their-roles
- https://www.bbc.co.uk/bitesize/guides/z989dmn/revision/1
- https://volleybox.net/the-shortest-volleyball-player-m19869
- https://protips.dickssportinggoods.com/sports-and-activities/volleyball-101-volleyball-positions-and-their-roles
- https://sportsshow.net/top-10-most-popular-sports-in-the-world/
- https://www.sportsrec.com/352681-history-of-volleyball-balls.html
- https://www.sutori.com/story/the-history-of-volleyball–GMEvebx6tveKAgTVDvBwsu3L
- https://www.scmp.com/sport/china/article/3009325/worlds-highest-paid-volleyball-player-zhu-ting-gives-millions-return
- https://www.urmc.rochester.edu/orthopaedics/sports-medicine/volleyball-injuries.cfm
- https://www.upmc.com/services/sports-medicine/for-athletes/volleyball
- https://www.theartofcoachingvolleyball.com/shoulder-circuit-exercises-for-volleyball-players/
- https://www.upmc.com/services/sports-medicine/conditions/patellar-tendonitis
- https://www.sportsmed.org/aossmimis/stop/downloads/Volleyball.pdf