@book{guile_contributors_gnu_2013,
    address = {Boston, {MA}},
    edition = {2.0.9},
    title = {{GNU} Guile Reference Manual},
    copyright = {{GNU} Free Documentation License},
    url = {http://www.gnu.org/software/guile/manual/},
    urldate = {2014-03-29},
    publisher = {Free Software Foundation},
    author = {Guile Contributors},
    year = {2013}
}