APA (7th ed.) Citation

Rupp, E. G. (1964). Luther's progress to the Diet of Worms. Harper & Row.

Chicago Style (17th ed.) Citation

Rupp, E. Gordon. Luther's Progress to the Diet of Worms. New York: Harper & Row, 1964.

MLA (8th ed.) Citation

Rupp, E. Gordon. Luther's Progress to the Diet of Worms. Harper & Row, 1964.