E. S. Manalu, R. Rika, dan T. M. S. B. Siregar, “SPEAKING CLASSROOM INTERACTION BASED ON INITIATION-RESPONSE-FEEDBACK (IRF) MODEL FOR GRADE VIII AT SMP NEGERI 16 MEDAN”, TRANSFORM, vol. 8, no. 1, Agu 2020, doi: 10.24114/tj.v8i1.19638.