PT Journal AU Hubalek, T TI Informacni zdroje vyuzivane studenty strednich skol pri vyuce modernich dejin SO Civilia PY 2014 BP 100 EP 106 VL 5 IS 2 DI 10.5507/civ.2014.014 DE modern history; source of information; grammer students; Olomouc region ER