@book
{TN_libero_mab2,
author = {
Lassalle, Ferdinand
Herwegh, Georg
AND
Herwegh, Marcel
},
title = {
Ferdinand Lassalle's Briefe an Georg Herwegh
},
publisher = {Müller},
year = {1896},
address = {
Zürich
},
url = {
http://slubdd.de/katalog?TN_libero_mab2
}
}