Yusuf, Vidya A. J., Widji Soeratri, and Tristiana Erawati. 2023. “The Effect of Surfactant Combination on the Characteristics, Stability, Irritability, and Effectivity of Astaxanthin Nanoemulsion As Anti-Ageing Cosmetics: Http: www.doi.org 10.26538 Tjnpr V7i12.21”. Tropical Journal of Natural Product Research (TJNPR) 7 (12): 5509-18. https://tjnpr.org/index.php/home/article/view/3187.