Akhirullah A, Harahap UN, Fazri M. West Store Medan Shoe Store Quality Improvement Plan Based on the Servqual and QFD Approach. IRA J.Tek. Mesin Dan Apl [Internet]. 2023 Aug. 27 [cited 2025 Jul. 10];2(2):69-80. Available from: http://e-journals.irapublishing.com/index.php/IRAJTMA/article/view/63