Rosalba Pepi and Maria Rita Faleri with Thessy Schoenholzer Nichols have just released their latest publication on Italian Tassels! It is a book called Nappe, forme di ornamento tessile [Tassels, forms of textile ornament].
(I've already sent my letter to Santa!)
The text is in both Italian and English.
You can go here to look at a few of the pages and see how the book is laid out (click on the picture of the cover to get started, then click the bottom right-hand corner to flip the pages).
There is a history section with photos of ancient tassels, you can zoom in and read some of it by clicking on the pages.
Then there are instructions and diagrams for making 30 different tassels.
For those in Italy, you can order the book directly from the website here, payment is by money transfer.
For those of us outside of Italy, Elena is carrying it on her website Italian Needlecrafts and she accepts PayPal (there are also a couple of different pages to look at there).