Mastering the Art of Arms: the Medieval Dagger, published by Freelance Academy Press in 2012, is a complete training method for Fiore dei Liberi's dagger combat.
It currently has six reviews on Amazon, all five-star; would you like to add your own?
It is also available in German:
You can get it from Amazon, iBooks, and Selz; as paperback, hardback, (by the end of August 2015). I'll upload the links when they are through the system…