From Zwingli’s Writings:

G. W. Bromiley, editor, Zwingli and Bullinger (The Library of Christian Classics; The Westminster Press, Philadelphia, 1979)

G. R. Potter, Huldrych Zwingli (Documents of Modern History, Edward Arnold, London, 1978)

Ulrich Zwingli; edited by Samuel Macauley Jackson and Clarence N. Heller, Commentary on True and False Religion (The Labyrinth Press, Durham, NC, 1981). Reprint of 1929 edition.

On Zwingli and the Swiss Reformation:

Jaques Courvoisier, Zwingli, a Reformed Theologian (John Knox Press, Richmond, VA, 1963).

Oskar Farner, translated by D. G. Sear, Zwingli the Reformer: His Life and Work (London, 1952).

Samuel Macauley Jackson, Huldreich Zwingli: The Reformer of German Switzerland (The Knickerbocker Press, 1901.)

H. Wayne Pipkin, A Zwingli Bibliography (Bibliographia Tripotamopolitana, No. 7: C. E. Barbour, Pittsburgh, 1972).

G. R. Potter, Zwingli (Cambridge University Press, 1977).

G. R. Potter, Ulrich Zwingli (The Historical Association, London, 1983).

Jean H. Rilliet, translated by Harold Knight, Zwingli, Third Man of the Reformation (The Westminster Press, Philadelphia, 1964).

Robert C. Walton, Zwingli’s Theocracy (University of Toronto, 1968).

Sigmund Widmer; translated by Carol Woodfin and Dietmar Lutz, Zwingli: Reformation in Switzerland (Theologischer Verlag Zurich, 1983).