Wijitsopa, G., and J. Phukaoluan. “Needs and Response of Service as perceived by their relative in the Intensive Care Unit at Krabi Hospital”. Krabi Medical Journal, vol. 3, no. 1, Mar. 2021, pp. 23-38, https://he01.tci-thaijo.org/index.php/KBJ/article/view/248042.