@book
{TN_libero_mab2,
author = {
Helms, Erwin
},
title = {
The German-Americans - an invisible minority?
},
publisher = {Schöningh},
year = {19XX-},
booktitle = {America in focus},
address = {
Paderborn
},
url = {
http://slubdd.de/katalog?TN_libero_mab2
}
}