From the web site you can order the Assidua, the Life of St. Anthony written by a Franciscan who was a contemporary of the Evangelic Doctor.
To my knowledge, this is the only English translation of the life of the Saint. I finally found it this past January when in the Vatican bookstore. It is very good.
You can also order several other books concerning the Saint of Padua, most notably his Sermsons for Sundays and Festivals two volumes, one for Sundays from Septuagesima to Pentecost and the other From the First Sunday after Pentecost to the Sixteenth Sunday After Pentecost.
There are a few other books whose titles are in English but whose descriptions are not. I may order or two and let you know what I think of them.
Unfortunately, the web site seems only to be in Italian so you'll have to guess your way around.