“Comparative Analysis of Free Formaldehyde Determination Methods in Acne Treatment Product Samples: Perbandingan Metode Pengujian Formaldehida Bebas pada Sampel Produk Anti jerawat”, Pharmasci, vol. 11, no. 2, pp. 307–322, Jul. 2026, doi: 10.53342/pharmasci.v11i2.598.