Sari, Mutiara, and Elsa Yuniarti. “The Effect of Sun Exposure on the Effectiveness of the Serotonin Hormone: Literature Review”. Jurnal Biologi Tropis 23, no. 4 (September 1, 2023): 91–97. Accessed November 22, 2024. http://jurnalfkip.unram.ac.id/index.php/JBT/article/view/5532.