1. Sari, F. S., & Kurniawan, A. (2010). Implementation of Indonesian electronic citation system based on web. Third International Conference on Knowledge Discovery and Data Mining—IEEE Transaction, 1, 494–497.
2. Liu, B. (2007). Web Data Mining: Exploring Hyperlinks, Contents, and Usage Data. Berlin: Springer.
3. Mehra, J., & Thakur, R. S. (2018). An Effective method for Web Log 3 preprocessing and page access frequency using web usage mining. International Journal of Applied Engineering Research, 13(2), 1227–1232.
4. Ceri, S., Bozzon, A., Brambilla, M., Della Valle, E., et al. (2013). Web information retrieval. Berlin: Springer.
5. Khalil, S., & Fakir, M. (2017). R Crawler: An R package for parallel web crawling and scraping. Software X, 6, 98–106.