Fadhila Dhuha Oktiana, Budi Santoso, and Rahmi Sulistyarini. “he eaning and imitations of the hrases “Valid” and ‘Appropriate’ in lectronic ummons from the erspec-ive of the rinciple of egal ertainty”. ournal of cience and ducation (JSE), vol. 6, no. 2, Jan. 2026, pp. 1374-80, doi:10.58905/jse.v6i2.734.