@book
{TN_libero_mab2,
author = {
Keller, Gottfried
Nussberger, Max
},
title = {
Kellers Briefe
},
publisher = {Bibliograph. Institut},
year = {[1927]},
booktitle = {Memoiren und Briefe},
address = {
Leipzig
},
url = {
http://slubdd.de/katalog?TN_libero_mab2
}
}