Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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