Pratiwi, Afrianty, et al. “Effects of Enhancment Span-60 of Vernonia Amygdalina Leaves Extract-Loaded Niosomes ”. Ad-Dawaa’ Journal of Pharmaceutical Sciences, vol. 6, no. 2, Dec. 2023, pp. 155-63, doi:10.24252/djps.v6i2.45956.