Não informado. (1955). Scientia paedagogica. International Secretariat for Teaching Educational Sciences in Universities.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Scientia Paedagogica. Gent, Belgica: International Secretariat for Teaching Educational Sciences in Universities, 1955.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Scientia Paedagogica. International Secretariat for Teaching Educational Sciences in Universities, 1955.
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