Não informado. (1964). Scientia paedagogica experimentalis. Centre for Experimental Educational Research.
Citace podle Chicago (17th ed.)Não informado. Scientia Paedagogica Experimentalis. Gent, Belgica: Centre for Experimental Educational Research, 1964.
Citace podle MLA (8th ed.)Não informado. Scientia Paedagogica Experimentalis. Centre for Experimental Educational Research, 1964.
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