Petersen, Klaus Tolstrup. “Plebiscite Notgeld from Schleswig 1919-1921: Propaganda or Money-Spinner?”. Academic Quarter | Akademisk kvarter 10, no. 21 (december 21, 2020): 74–89. Set maj 8, 2024. https://journals.aau.dk/index.php/ak/article/view/6390.