Khatkhamwong, C., W. Chidnok, and C. Jones. “A New Cardiovascular Fitness Test Using Incremental Spot Marching Exercise in Healthy Male Subjects: Physiological Responses”. Archives of Allied Health Sciences, vol. 31, no. 3, Dec. 2019, pp. 253-61, https://he01.tci-thaijo.org/index.php/ams/article/view/232618.