@book
{TN_libero_mab2,
author = {
Moore, Michael G.
AND
Thompson, Melody M.
},
title = {
The effects of distance learning
},
edition = {
Rev. ed.
}
,
publisher = {American Center for the Study of Distance Education, Pennsylvania State University},
isbn = {1877780189},
year = {1997},
booktitle = {ACSDE research monograph ; 15},
address = {
University Park, PA
},
url = {
http://slubdd.de/katalog?TN_libero_mab2
}
}