APA (7th ed.) Citation

Helmer, C. (2019). How Luther became the reformer (First edition.). Westminster John Knox Press.

Chicago Style (17th ed.) Citation

Helmer, Christine. How Luther Became the Reformer. First edition. Louisville, KY: Westminster John Knox Press, 2019.

MLA (9th ed.) Citation

Helmer, Christine. How Luther Became the Reformer. First edition. Westminster John Knox Press, 2019.

Warning: These citations may not always be 100% accurate.