Laila, E. and Ulianas, A. (2019) “ANALISIS PENYEBAB KESULITAN SUB MATERI POKOK KIMIA SEMESTER 1 KELAS X IPA 3 MENGGUNAKAN METODE LEAN SIX SIGMA DI SMA NEGERI 8 PADANG”, Ranah Research : Journal of Multidisciplinary Research and Development, 1(4), pp. 1139 - 1147. Available at: https://jurnal.ranahresearch.com/index.php/R2J/article/view/183 (Accessed: 27April2024).