Jalaluddin, Syatirah, et al. “The Cortisol Serum Measurement As a Marker of Stress in Neonates”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 39, no. 1, May 2018, pp. 51-58, https://gssrr.org/JournalOfBasicAndApplied/article/view/8998.