Singgalen, Yerik. “Sentiment Analysis and Trend Mapping of Hotel Reviews Using LSTM and GRU”. Journal of Information Systems and Informatics 6, no. 4 (December 31, 2024): 2814-2836. Accessed December 19, 2025. https://journal-isi.org.adsii.or.id/index.php/isi/article/view/926.