@book{justhis6147,
           title = {Les soci{\'e}t{\'e}s coop{\'e}ratives},
          author = {J. Tkint and M. Godin},
         address = {Bruxelles},
       publisher = {Larcier},
            year = {1968},
             url = {http://www.just-his.be/eprints/6147/}
}