Nawasta, Revanto Alif, Nur Heri Cahyana, and Heriyanto Heriyanto. “Implementation of Mel-Frequency Cepstral Coefficient As Feature Extraction Using K-Nearest Neighbor for Emotion Detection Based on Voice Intonation”. Telematika: Jurnal Telematika dan Teknologi Informasi 20, no. 1 (March 1, 2023): 51–62. Accessed December 5, 2025. https://jurnal.upnyk.ac.id/index.php/telematika/article/view/9518.