APA (7th ed.) Citation

Luther, M., Erasmus, D., Rupp, E. G., & Watson, P. S. (1969). Luther and Erasmus: Free will and salvation. Westminster Press.

Chicago Style (17th ed.) Citation

Luther, Martin, Desiderius Erasmus, E. Gordon Rupp, and Philip S. Watson. Luther and Erasmus: Free Will and Salvation. Philadelphia: Westminster Press, 1969.

MLA (9th ed.) Citation

Luther, Martin, et al. Luther and Erasmus: Free Will and Salvation. Westminster Press, 1969.