http://repository.uhamka.ac.id/id/eprint/12997/
sertifikat Presenter The 2nd Internasinal Conference INSSE 2021
Bambang, Dwi Hartono
http://repository.uhamka.ac.id/id/eprint/12997/1/sertifikat%20Presenter%20%20The%202nd%20Internasinal%20Conference%20INSSE%202021.pdf