@article{Ladewig Petersen_1974, title={M. M. Postan: Essays on Medieval Agriculture and General Problems of the Medieval Economy. Cambridge, at the University Press, 1973. - viii + 302 s.; £4.80. M. M. Postan: Medieval Trade and Finance. Cambridge, at the University Press, 1973. - vii + 382 s.; £5.00.}, volume={13}, url={https://tidsskrift.dk/historisktidsskrift/article/view/51533}, journal={Historisk Tidsskrift}, author={Ladewig Petersen, E.}, year={1974}, month={jan.} }