Campi, Emidio. 2010. „Charles S. McCoy and J. Wayne Baker, Fountainhead of Federalism. Heinrich Bullinger and the Convenantal Tradition, With a Translation of De Testamento Seu Foedere Die Unico Et Aeterno (1534) by Heinrich Bullinger, Louisville, KY 1991“. Zwingliana 21 ( ):155-57. https://www.zwingliana.ch/index.php/zwa/article/view/416.