Most Anabaptist studies prior to 1800 were done by authors hostile to the Anabaptists and are not balanced. Or they were done by Landmark baptists seeking to trace believer's baptism back to John the Baptist and thus tend to include any and every group that might help make the case despite the group's other views which were often heretical. Modern studies like Estep and Williams have separated the nuts from the godly and given us a more balanced perspective.
A second generation Anabaptism worth studying is Menno Simons (progenitor of the Mennonites). He is the most significant individual in uniting the fractured Anabatptists. (Anabaptists in the early 1530s seized Munster and tried to set up a theocracy. They received the Janet Reno Waco treatment. This incident gave Anabaptism a black eye for decades and even centuries.) Menno's writings, which include extensive theological studies are readily available.
There are ties between Dutch Anabaptism and the earliest English Baptists -- this was the focus of my dissertation.