Two sources in Figure 6 not yet mentioned are Bullinger’s Bibliography ( <hi xmlns="http://www.tei-c.org/ns/1.0" rend="italic">HBBibl)</hi>and the Zwingliana ( <hi xmlns="http://www.tei-c.org/ns/1.0" rend="italic">Zwa)</hi>, a scholarly publication dedicated to the history of Protestantism in Switzerland and its wider impact. The inclusion of the former is unsurprising in an edition of Bullinger’s correspondence, while the latter demonstrates the editors' commitment to situating the text not only within its historical context but also within the framework of current research and scholarship on the subject.