Não informado. (1955). Scientia paedagogica. International Secretariat for Teaching Educational Sciences in Universities.
Chicago-referens (17:e uppl.)Não informado. Scientia Paedagogica. Gent, Belgica: International Secretariat for Teaching Educational Sciences in Universities, 1955.
MLA-referens (8:e uppl.)Não informado. Scientia Paedagogica. International Secretariat for Teaching Educational Sciences in Universities, 1955.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.