Ariyanti, E. Masruriati, H. Santi, and D. Sulistyowati. “Formulation Stability Analysis Aloe Vera Leaf Extract Gel and Shell Shell Collagen”. International Journal of Health Sciences, vol. 6, no. S3, Apr. 2022, pp. 2115-23, doi:10.53730/ijhs.v6nS3.5958.