Shamsudin, N. F., H. Basiron, Z. Saaya, A. F. N. Abdul Rahman, M. H. Zakaria, and N. Hassim. “SENTIMENT CLASSIFICATION OF UNSTRUCTURED DATA USING LEXICAL BASED TECHNIQUES”. Jurnal Teknologi, vol. 77, no. 18, Nov. 2015, doi:10.11113/jt.v77.6497.