Cita APA (7a ed.)

Rupp, E. G., & Drewery, B. (1970). Martin Luther. Arnold.

Cita Chicago Style (17a ed.)

Rupp, Ernest Gordon, y Benjamin Drewery. Martin Luther. London: Arnold, 1970.

Cita MLA (9a ed.)

Rupp, Ernest Gordon, y Benjamin Drewery. Martin Luther. Arnold, 1970.