Wedell, E. G. (1970). The place of education by correspondence in permanent education: A study of correspondence in the member States of the Council of Europe.
Chicago-referens (17:e uppl.)Wedell, E. G. The Place of Education by Correspondence in Permanent Education: A Study of Correspondence in the Member States of the Council of Europe. Strasbourg, 1970.
MLA-referens (8:e uppl.)Wedell, E. G. The Place of Education by Correspondence in Permanent Education: A Study of Correspondence in the Member States of the Council of Europe. 1970.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.