APA (7th ed.) Citation

Luther, M., & Grimm, H. J. (2003). On christian liberty. Fortress Press.

Chicago Style (17th ed.) Citation

Luther, Martin, and Harold John Grimm. On Christian Liberty. Minneapolis: Fortress Press, 2003.

MLA (9th ed.) Citation

Luther, Martin, and Harold John Grimm. On Christian Liberty. Fortress Press, 2003.