Karup Pedersen, O. (1991) “Ger van Roon: Small States in Years of Depression. The Oslo Alliance 1930-1940. Van Gorcurm, Assen/Maastricht, The Netherlands. 1989. 382 s”., Historisk Tidsskrift, 15. Tilgængelig hos: https://tidsskrift.dk/historisktidsskrift/article/view/53365 (Set: 5 december 2025).