Makkayu, Juand Valentino, et al. “The Effect of HPMC and PVP Bases on the Formulation of Physical Properties and Transdermal Stability of Patch Estrak Leaves of Jarak Pagar (Jatropha Curcas L.)”. Jurnal Biologi Tropis, vol. 25, no. 1, Mar. 2025, pp. 1119-25, doi:10.29303/jbt.v25i1.8783.