Ladewig Petersen, E. (1998) “Erik Ringmar: Identity, Interest and Action: A culturel explanation of Sweden’s intervention in the Thirty Years War. (Cambridge University Press, 1996). 284 s., 40 £”., Historie/Jyske Samlinger, (1), s. 187. Tilgængelig hos: https://tidsskrift.dk/historiejyskesamling/article/view/37813 (Set: 21 januar 2026).