@book
{TN_libero_mab2,
author = {
Hessel, Alfred
},
title = {
Geschichte der Stadt Bologna von 1116 bis 1280
},
publisher = {Ebering},
year = {1910},
booktitle = {Historische Studien ; 76},
address = {
Berlin
},
url = {
http://slubdd.de/katalog?TN_libero_mab2
}
}