APA (7th ed.) Citation

Ludwig, O., & Ludwig, C. (1903). Gedanken Otto Ludwigs. Diederichs.

Chicago Style (17th ed.) Citation

Ludwig, Otto, and Cordelia Ludwig. Gedanken Otto Ludwigs. Leipzig: Diederichs, 1903.

MLA (9th ed.) Citation

Ludwig, Otto, and Cordelia Ludwig. Gedanken Otto Ludwigs. Diederichs, 1903.

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