Sources

https://www.womenssportsfoundation.org/education/the-original-9/

https://www.billiejeanking.com/battle-of-the-sexes/

https://www.history.com/this-day-in-history/first-battle-of-the-sexes

https://www.britannica.com/topic/Battle-of-the-Sexes-tennis

https://www.womenssportsfoundation.org/education/the-original-9/