APA (7th ed.) Citation

(1973). Speyer cathedral: Cathedral church. Papal basilica (3a. ed.). Schnell and Stein.

Chicago Style (17th ed.) Citation

Speyer Cathedral: Cathedral Church. Papal Basilica. 3a. ed. Múnich: Schnell and Stein, 1973.

MLA (9th ed.) Citation

Speyer Cathedral: Cathedral Church. Papal Basilica. 3a. ed. Schnell and Stein, 1973.