REFERENCES

Baseline Staff. "ITF Releases Global Tennis Report with 87 Million Players." Baseline, USTA 15 Oct 2019, http://baseline.tennis.com/article/85476/itf-study-global-tennis-report-results.

"ITF Global Tennis Report 2019." International Tennis Federation, 2019.

Mather, George. "Perpetual Uncertainty and Line-Call Challenges in Professional Tennis." National Institutes of Health, The Royal Society, 22 July 2008, https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2602819/.

Voss, Gregg. "Court costs: Travel, private lessons can make tennis an expensive sport." Chicago Tribune, Tribune Publishing, 10 Aug 2019, https://www.chicagotribune.com/suburbs/arlington-heights/sports/ct-mun-girls-tennis-preview-cost-to-play-tl-0815-20190810-53hvwgm4xjggxeyftk2cypqwgy-story.html.

Yazici, Ahmet B, et al. "Tennis Enhances Well-Being in University Students." National Institutes of Health, Emerald Publishing, 18 May 2016, https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4926036/.