Siti Hannah Sabtu, Mohd Effendi @ Ewan Mohd Matore, Siti Mistima Maat. Content Validity Of Teacher Teaching Quality Measurement Using The Six Sigma Approach Based On The Fuzzy Delphi Method. kuey [Internet]. 2024 May 27 [cited 2026 Apr. 6];30(5):9788-9. Available from: https://www.kuey.net/index.php/kuey/article/view/4656