Purwaningsih, R., Simanjuntak, C. F. and Rosyada, Z. F. (2020) “Eco-Efficiency of Pencil Preduction Using Life Cycle Assessment to Increase the Manufacture Sustainability”, Jurnal Teknik Industri: Jurnal Keilmuan dan Aplikasi Teknik Industri, 22(1), pp. 47-54. doi: 10.9744/jti.22.1.47-52.