Erik Skydsgaard, J. (1991) “Jørgen Bæk Simonsen: Studies in the Genesis and Early Development of the Caliphal Taxation System. Kbh., Akademisk Forlag, 1988, 213 sider”., Historisk Tidsskrift, 15. Tilgængelig hos: https://tidsskrift.dk/historisktidsskrift/article/view/53308 (Set: 6 december 2025).