@misc{die+mustergiltingen+kirchenbauten+des+mittelalters+in+deutschland,
    author = {Schaefer, Carl i Stiehl, Otto},
    title = {Die Mustergiltingen Kirchenbauten des Mittelalters in Deutschland},
    address = {Berlin},
    publisher = {Verl. von Ernst Wasmuth},
    date = {1902}
}