http://repository.uhamka.ac.id/4436/ Bambang, Dwi Hartono http://repository.uhamka.ac.id/4436/1/7.1.4%20Surat%20paten%20HaKI%20atau%20keterangan%20sejenis.pdf Bambang, Dwi Hartono 7.1.4 Surat paten HaKI atau keterangan sejenis. Documentation. MM UHAMKA. (Submitted)