Links:[1] https://pepak.sabda.org/edisi_pepak/e_binaanak_269_arti_penting_melayani [2] https://pepak.sabda.org/epublish/1 [3] https://pepak.sabda.org/epublish/1/269 [4] https://pepak.sabda.org/tanya_alat_peraga_0