Não informado. (1948). Educational Review. University of Birminghan, Institute of Education.
Lua i Stíl Chicago (17ú heag.)Não informado. Educational Review. Edinburgh, Inglaterra: University of Birminghan, Institute of Education, 1948.
Lua MLA (8ú heag.)Não informado. Educational Review. University of Birminghan, Institute of Education, 1948.
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