Não informado. (1962). Theory into practice. Ohio State University, Bureau of Educational Research and Service.
Čikaški stil citiranja (17. izdanje)Não informado. Theory into Practice. Columbus, Ohio: Ohio State University, Bureau of Educational Research and Service, 1962.
MLA način citiranja (8. izdanje)Não informado. Theory into Practice. Ohio State University, Bureau of Educational Research and Service, 1962.
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