“Identification Retinoic Acid Content in Online Whitening Cream Sold in Samarinda City Using Thin Layer Chromatography (TLC) and Spectrophotometry UV-Visible Methods”. Journal of Pharmaceutical and Sciences, vol. 5, no. 2, July 2022, pp. 174-80, https://doi.org/10.36490/journal-jps.com.v5i2.112.