This bibliographical review of works on Ulrich Zwingli is partial evidence of a quarter-century of considerable scholarly activity directed toward the history of the continental Reformed churches. At first glance, the memorial volumes commemorating the 400th anniversary of the Zurich Reformation (1519–1919) and of the Reformer's death at Kappel (1531–1931) would seem to account for the inordinate number of Zwingli studies since 1918; but an equal volume of scholarship devoted, without such promptings, to Martin Bucer, or the Weber Thesis, or the Reformation in the Netherlands confirms the trend toward intrested historical inquiry, stimulated perhaps by the return to the mainstream of Reformation thought.