Hasibuan , H. A. H. ., U. N. . Harahap, Z. . Zaharuddin, and M. . Idris. “Application of Kansei Engineering Method in Soap Product Innovation”. IRA Jurnal Teknik Mesin Dan Aplikasinya (IRAJTMA), vol. 4, no. 1, Apr. 2025, pp. 120-7, doi:10.56862/irajtma.v4i1.182.