Kartini, K., Winarjo, B. M., Fitriani, E. W. and Islamie, R. (2017) “Formulation and pH-Physical Stability Evaluation of Gel and Cream of Plantago major Leaves Extract”, MPI (Media Pharmaceutica Indonesiana), 1(3), pp. 174-180. doi: 10.24123/mpi.v1i3.330.