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 Samling, (1), p. 187. Available at: https://tidsskrift.dk/historiejyskesamling/article/view/37813 (Accessed: 6 December 2025).