Nugroho, K., Edy Winarno, Eri Zuliarso, and Sunardi. “Multi-Accent Speaker Detection Using Normalize Feature MFCC Neural Network Method”. Jurnal RESTI (Rekayasa Sistem Dan Teknologi Informasi), Vol. 7, no. 4, Aug. 2023, pp. 832 -36, doi:10.29207/resti.v7i4.4652.