@book {TN_libero_mab2,

author = { Cicero, Marcus Tullius Giebel, Marion },

title = { Wahre Freunde },

publisher = {Philipp Reclam jun.},

publisher = {},

isbn = {3150108551},

isbn = {9783150108550},

keywords = { Freundschaft },

year = {[2012]},

address = { Stuttgart , },

}