Mohammad, Irfan, 		Na'im, Mohamad, AND 		Puji, Rully Putri Nirmala.
" THE IMPLEMENTATION OF PROBLEM BASED LEARNING THROUGH AUDIO VISUAL MEDIA IN IMPROVING STUDENT’S  BASIC LEVEL OF CRITICAL THINKING ABILITY  AND HISTORY LEARNING OUTCOMES" <em>JURNAL HISTORICA</em> [Online], Volume 3 Number 1 (9 May 2019)