I figured I would make a list of the books I use on a regular basis to hunt up the recipes I use and redact. This list will be incomplete and I will update it as I find my books (they are spread everywhere right now!).
The Good Housewife's Jewel, Thomas Dawson
To The King's Taste, Lorna Sass
The Medieval Cookbook, Maggie Black
Platina's On Right Pleasure and Good Health, Mary Ella Milham, Pegasus Press
The Neapolitan Collection, Terrence Scully
The Forme of Cury, Samuel Pegge
The Opera of Bartolomeo Scappi (1570), Terrence Scully
Turkey Legs and Scotch Eggs, International Wenches Guild Local 24, This is a cookbook put together by a group of people for a fundraiser. The end section has "medieval" recipes and those I have used that have sources I have hunted down.