T. M. Ambarita, Pretti, et al. “THE INFLUENCE OF LEARNING INSTRUMENTS PROBLEM BASED LEARNING MODEL TO IMPROVE PHYSICS LEARNING OUTCOMES IN STATIC FLUID”. Jurnal Pendidikan Fisika, vol. 5, no. 2, Dec. 2016, pp. 106-11, doi:10.22611/jpf.v5i2.4408.