SUNDHAUSSEN, H. Creveld, Martin L.: Hitler’s Strategy 1940—1941. The Balkan Clue. Südost-Forschungen, [S. l.], v. 1, n. 1, p. 290–293, 2021. Disponível em: https://www.suedost-forschungen.de/portal/index.php/sof/article/view/10576. Acesso em: 1 mai. 2025.