Franzén, B. (2013) “Nils Hybel and Bjørn Poulsen: The Danish resources c. 1000-1550. Growth and recession. Leiden, Brill, 2007”., Historisk Tidsskrift, 108(2). Tilgængelig hos: https://tidsskrift.dk/historisktidsskrift/article/view/56382 (Set: 5 december 2025).