Mezga, Kim, Petra Vrhovnik, Dragana Šolaja, Lidia Gullón, Alenka Mauko Pranjić, & Ainara Garcia Uriarte. " EXPLORE THE BRIEFCASE - LEARNING ABOUT RAW MATERIALS THROUGH NON-CONVENTIONAL TEACHING TOOLS." Geologica Macedonica [Online], 33.2 (2019): 159-166. Web. 10 Aug. 2020