APA (7th ed.) Citation

Romer, W. (1991). Das Papst-Portal von Kevelaer. Butzon & Bercker.

Chicago Style (17th ed.) Citation

Romer, Werner. Das Papst-Portal Von Kevelaer. Kevelaer: Butzon & Bercker, 1991.

MLA (8th ed.) Citation

Romer, Werner. Das Papst-Portal Von Kevelaer. Butzon & Bercker, 1991.

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