@book
{TN_libero_mab2,
author = {
Cicero, Marcus Tullius
Atzert, Karl
AND
Atzert, Karl
},
title = {
De officiis
},
publisher = {Steffen},
year = {1951},
booktitle = {Griechisch-römische Schriftenreihe in deutscher Sprache},
address = {
Limburg
},
url = {
http://slubdd.de/katalog?TN_libero_mab2
}
}