@book
{TN_libero_mab2,
author = {
Summers, Della
},
title = {
Longman language activator
helps you write and speak natural English
},
edition = {
8. impr.
}
,
publisher = {Longman},
isbn = {0582415489},
isbn = {9780582415485},
year = {2008},
address = {
Harlow
},
url = {
http://slubdd.de/katalog?TN_libero_mab2
}
}