Bargello Florentine Canvas Work by Elsa S Williams, 1967
This book is on the EGA Bibliography for Master Craftsman Canvaswork, Step 4.
There are no diagrams but the photos are clear enough to follow. Color combinations are included for each pattern although they are easily changed because you use shades of various colors. This book has a floral medallion done in basketweave in the center of a bargello pattern. That is a great idea.