Fitriani, Lili, et al. “Formulation of Metformin HCl Floating Tablet Using HPC, HPMC K100M, and the Combinations”. Jurnal Sains Farmasi & Klinis, vol. 4, no. 1, Dec. 2017, pp. 79-82, doi:10.29208/jsfk.2017.4.1.201.