Himah, Elok, 		Bektiarso, Singgih, AND 		Prihandono, Trapsilo.
" PENERAPAN MODEL PROBLEM BASED LEARNING (PBL) DISERTAI METODE PICTORIAL RIDDLE DALAM PEMBELAJARAN FISIKA DI SMA" <em>JURNAL PEMBELAJARAN FISIKA</em> [Online], Volume 4 Number 3 (1 December 2015)