E. Campi, „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“, Zwa, Bd. 21, Nr. , S. 155–157, Jan. 2010.