(1973). Speyer cathedral: Cathedral church. Papal basilica (3a. ed.). Schnell and Stein.
Chicago-čujuhus (17. p.)Speyer Cathedral: Cathedral Church. Papal Basilica. 3a. ed. Múnich: Schnell and Stein, 1973.
MLA-čujuhus (9. p.)Speyer Cathedral: Cathedral Church. Papal Basilica. 3a. ed. Schnell and Stein, 1973.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.