APA (7th ed.) Citation

Steck, K. G., Gollwitzer, H., & Luther, M. (1960). Martin Luther. Fischer Bücherei.

Chicago Style (17th ed.) Citation

Steck, Karl Gerhard, Helmut Gollwitzer, and Martin Luther. Martin Luther. Frankfurt am Main: Fischer Bücherei, 1960.

MLA (8th ed.) Citation

Steck, Karl Gerhard, et al. Martin Luther. Fischer Bücherei, 1960.