Putri NPWMK, Utama IP, Darmawijaya IG. The implementation of six sigma DMAIC in evaluation of direct booking improvement strategy at Alpha hotel management. J. Pariwisata Pesona. [Internet]. 2025 Jul. 3 [cited 2026 Jun. 24];10(1):62-71. Available from: https://jurnal.unmer.ac.id/index.php/jpp/article/view/13968