Boonnuch, C., Swangpanich, S., Jaichuen, S., Temchavala, K. and Chansukitmathee, S. (2006) “Internal Customer Satisfaction at Department of Nursing, Siriraj Hospital”, Siriraj Medical Journal, 58(10), pp. 1042–1045. available at: https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/245936 (accessed: 9 October 2026).