Não informado. (1955). Scientia paedagogica. International Secretariat for Teaching Educational Sciences in Universities.
Chicago-Zitierstil (17. Ausg.)Não informado. Scientia Paedagogica. Gent, Belgica: International Secretariat for Teaching Educational Sciences in Universities, 1955.
MLA-Zitierstil (8. Ausg.)Não informado. Scientia Paedagogica. International Secretariat for Teaching Educational Sciences in Universities, 1955.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.