Potts, W.T.W., 'The Pre-Danish Estate of Peterborough Abbey', in Proceedings of the Cambridge Antiquarian Society 65, 1974: this paper contains some substantive errors, but is of interest.
Gyrwe Potts, W.T.W., 'The Pre-Danish Estate of Peterborough Abbey', u Proceedings of the Cambridge Antiquarian Society 65, 1974: ovo vrelo sadrži neke supstantivne pogrješke, ali je još uvijek korisno u istraživanju.