Studi Observasi Penerapan K3L, Kode Etik Keinsinyuran dan Profesionalisme Pada Pekerjaan Scaffolding Ringlock Di Proyek Nusantara International Convention & Exhibition Center (NICE) = Observation Study of the Implementation of K3L, Engineering Code of Ethics and Professionalism in Ringlock Scaffolding Work at the Nusantara International Convention & Exhibition Center (NICE) Project