Kristanda, Marcel Bonar, Seng Hansun, and Albert Albert. 2018. “Rancang Bangun Aplikasi UMN Library Catalog Menggunakan Metode Rocchio Relevance Feedback”. Ultima InfoSys : Jurnal Ilmu Sistem Informasi 9 (1):9-17. https://doi.org/10.31937/si.v9i1.684.