Rinaldo, H. and Sulistiyowati, W. 2026. Donut Production Sigma Level and Strategic Positioning: Tingkat Sigma Produksi Donat dan Posisi Strategis. Indonesian Journal of Innovation Studies. 26, 2 (Feb. 2026), 10.21070/ijins.v26i2.2032. DOI:https://doi.org/10.21070/ijins.v26i2.2032.