Do Thi Kim Anh, Nattinee Jantaratnotai, Somchai Manopatanakul, and Praewpat Pachimsawat. “Stress affects daily salivary cortisol profiles”. Journal of Current Science and Technology, vol. 11, no. 2, May 2021, pp. 261-8, https://ph04.tci-thaijo.org/index.php/JCST/article/view/403.