6. References:
Brungi, P. (2014). "The Tennis Ball Experiment" Independent Science Research Project Retrieved January 15, 2021, from https://prathushascienceresearchproject.weebly.com/conclusion--discussion.html
Michele, M. (2009). "What are ping pong balls made of?" Sportsrec Retrieved January 15, 2021, from https://www.sportsrec.com/what-ping-pong-balls-made-4923247.html
Tennis Uni. (2020). "Tennis Ball - The Ultimate Guide" Tennis Uni Retrieved January 15, 2021, from https://tennis-uni.com/en/tennis-balls/
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