@article{article, title = {{The simony crisis of the eleventh century and the ‘Letter of Guido’}}, publisher = {{Cambridge University Press (CUP)}}, url = {{https://eprints.whiterose.ac.uk/169771/ }}, year = {{2021}}, month = {{9}}, author = {{West C}}, doi = {{10.1017/S0022046921000063}}, volume = {{73}}, journal = {{Journal of Ecclesiastical History}}, issue = {{2}}, pages = {{229-253}}, note = {{Accessed on 2024/12/22}}}