Erik Skydsgaard, Jens. “Jørgen Bæk Simonsen: Studies in the Genesis and Early Development of the Caliphal Taxation System. Kbh., Akademisk Forlag, 1988, 213 Sider”. Historisk Tidsskrift 15 (januar 1, 1991). Set december 5, 2025. https://tidsskrift.dk/historisktidsskrift/article/view/53308.