@book
{TN_libero_mab2,
author = {
Gaudig, Hugo
},
title = {
Freie geistige Schularbeit in Theorie und Praxis
},
edition = {
2. Aufl.
}
,
publisher = {Hirt},
keywords = {
Teaching
,
Schools
},
year = {1922},
address = {
Breslau
},
url = {
http://slubdd.de/katalog?TN_libero_mab2
}
}