KUKANJA-GABRIJELČIČ, Mojca, 2015, Learning from history textbooks - is it challenging for gifted students? An international comparative analysis of questions and tasks in history textbooks. [na spletu]. 2015. Vol. 13, no. 1, p. 23–35. [Dostopano 5 april 2025]. Pridobljeno s: http://www.history.org.uk/resources/secondary_resource_8722_149.html