Following Erasmus, the next most cited source is the <hi xmlns="http://www.tei-c.org/ns/1.0" rend="italic">Eidgenössische Abschiede</hi>(EA), a collection of minutes from the Old Swiss Confederacy's federal assembly. This source provides valuable historical insights into political developments, which is particularly relevant given Bullinger’s active involvement in contemporary politics. Two other key sources offering political context are the political correspondence of Strassburg (PC) and the Zurich Reformation files (AZürcherRef).