APA (7th ed.) Citation

Köstlin, J. (1903). Martin Luther. Duncker.

Chicago Style (17th ed.) Citation

Köstlin, Julius. Martin Luther. Berlin: Duncker, 1903.

MLA (8th ed.) Citation

Köstlin, Julius. Martin Luther. Duncker, 1903.

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