Não informado. (1962). Theory into practice. Ohio State University, Bureau of Educational Research and Service.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Theory into Practice. Columbus, Ohio: Ohio State University, Bureau of Educational Research and Service, 1962.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Theory into Practice. Ohio State University, Bureau of Educational Research and Service, 1962.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.