UKPONG, Nkopuyo Samuel. Labour Productivity in Plastering Works Under Direct Labour and Traditional Procurement Delivery Systems. Faculty of Natural and Applied Sciences Journal of Applied and Physical Sciences, [S. l.], v. 2, n. 4, p. 1–6, 2025. DOI: 10.63561/japs.v2i4.1024. Disponível em: https://fnasjournals.com/index.php/FNAS-JAPS/article/view/1024. Acesso em: 21 feb. 2026.