I am asked this question often. Via email, Facebook, and in person. So, I figured I would post where my books can be purchased, and here it is.
Also, Hudson Booksellers – Inquire at any airport in the U.S. and some abroad – click the below link
Just a note a new revision is coming your way shortly for Piazza Navona (ebook and paperback). In the meantime order Nob Hill and I will announce when the freshly pressed volume is available.