APA (7th ed.) Citation

Metzger, M. J., & Bäcker, H. (1948). Gefangenschaftsbriefe Una-Sancta-Bücherei.

Chicago Style (17th ed.) Citation

Metzger, Max Josef, and Hannes Bäcker. "Gefangenschaftsbriefe." Una-Sancta-Bücherei 1948.

MLA (9th ed.) Citation

Metzger, Max Josef, and Hannes Bäcker. "Gefangenschaftsbriefe." Una-Sancta-Bücherei, 1948.

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