Não informado. (1958). Educational Research. National Foundation for Educational Research.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Educational Research. Oxfordshire, Inglaterra: National Foundation for Educational Research, 1958.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Educational Research. National Foundation for Educational Research, 1958.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.