Gregić, H. (2020). Atentat u Beogradskoj skupštini 1928. godine: uzroci i posljedice (Undergraduate thesis). Osijek: Josip Juraj Strossmayer University of Osijek, Faculty of Humanities and Social Sciences. Retrieved from https://urn.nsk.hr/urn:nbn:hr:142:960573
Gregić, Helena. "Atentat u Beogradskoj skupštini 1928. godine: uzroci i posljedice." Undergraduate thesis, Josip Juraj Strossmayer University of Osijek, Faculty of Humanities and Social Sciences, 2020. https://urn.nsk.hr/urn:nbn:hr:142:960573
Gregić, Helena. "Atentat u Beogradskoj skupštini 1928. godine: uzroci i posljedice." Undergraduate thesis, Josip Juraj Strossmayer University of Osijek, Faculty of Humanities and Social Sciences, 2020. https://urn.nsk.hr/urn:nbn:hr:142:960573
Gregić, H. (2020). 'Atentat u Beogradskoj skupštini 1928. godine: uzroci i posljedice', Undergraduate thesis, Josip Juraj Strossmayer University of Osijek, Faculty of Humanities and Social Sciences, accessed 28 August 2024, https://urn.nsk.hr/urn:nbn:hr:142:960573
Gregić H. Atentat u Beogradskoj skupštini 1928. godine: uzroci i posljedice [Undergraduate thesis]. Osijek: Josip Juraj Strossmayer University of Osijek, Faculty of Humanities and Social Sciences; 2020 [cited 2024 August 28] Available at: https://urn.nsk.hr/urn:nbn:hr:142:960573
H. Gregić, "Atentat u Beogradskoj skupštini 1928. godine: uzroci i posljedice", Undergraduate thesis, Josip Juraj Strossmayer University of Osijek, Faculty of Humanities and Social Sciences, Osijek, 2020. Available at: https://urn.nsk.hr/urn:nbn:hr:142:960573