Não informado. (1962). Theory into practice. Ohio State University, Bureau of Educational Research and Service.
Chicago-referens (17:e uppl.)Não informado. Theory into Practice. Columbus, Ohio: Ohio State University, Bureau of Educational Research and Service, 1962.
MLA-referens (8:e uppl.)Não informado. Theory into Practice. Ohio State University, Bureau of Educational Research and Service, 1962.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.