Siregar, C., J. Reveny, and A. Dalimunthe. “Formulation and Clinical Evaluation of Anti-Aging Activity of Blemish Balm Cream Vitamin E and Determination of SPF Value With Spectrophotometry”. Asian Journal of Pharmaceutical Research and Development, Vol. 7, no. 6, Dec. 2019, pp. 35-42, doi:https://doi.org/10.22270/ajprd.v7i6.623.