MIFTARI-FETISHI, Igballe. TESTING TEST VALIDITY AND RETENTION THROUGH THE WASHBACK EFFECT: A CASE STUDY. KNOWLEDGE - International Journal , [S. l.], v. 64, n. 1, p. 67–71, 2024. Disponível em: https://ojs.ikm.mk/index.php/kij/article/view/6778. Acesso em: 4 aug. 2026.