Putri, N. P. W. M. K., Utama, I. P., & Darmawijaya, I. G. (2025). The implementation of six sigma DMAIC in evaluation of direct booking improvement strategy at Alpha hotel management. Jurnal Pariwisata Pesona, 10(1), 62–71. https://doi.org/10.26905/jpp.v10i1.13968