1. Anglo-Norman Dictionary. https://anglo-norman.net/. Copyright institution: University of Aberystwyth. For a list of editors and project members, see https://anglo-norman.net/project-members/.
2. Anglo-Norman Correspondence Corpus (Birmingham City University, by request). Compiled by Richard Ingham, 2008.
3. Corpus of Middle English Verse and Prose. http://quod.lib.umich.edu/c/cme/. Copyright institution: The Humanities Text Initiative, University of Michigan.
4. Corpus of Early English Correspondence. 1998. Compiled by Terttu Nevalainen, Helena Raumolin- Brunberg, Jukka Keränen, Minna Nevala, Arja Nurmi, and Minna Palander-Collin at the Department of Modern Languages, University of Helsinki.
5. Davis, Norman (ed.). 1971–1976. Paston Letters and Papers of the Fifteenth Century. Parts 1 and 2. Oxford University Press.