Wattanaviroj, A., S. . Songtrakoon, and S. Anusasananan. “The Relationship of Maximal Oxygen Consumption Measures by Astrand-R Vhming Test and Step Test at Different Step Box Heights”. Academic Journal of Thailand National Sports University, vol. 7, no. 2, Mar. 2022, pp. 171-80, https://he02.tci-thaijo.org/index.php/TNSUJournal/article/view/256468.