Seubnuch, P., and P. Methakeson. “A randomized controlled trial of umbilical venous catheterization in neonates: comparison between the revised method and the method of Shukla and Ferrara”. Journal of Nakornping Hospital, vol. 13, no. 1, Apr. 2022, pp. 70-82, https://he01.tci-thaijo.org/index.php/jnkp/article/view/250331.