Não informado. (1958). Educational Research. National Foundation for Educational Research.
Chicago-referens (17:e uppl.)Não informado. Educational Research. Oxfordshire, Inglaterra: National Foundation for Educational Research, 1958.
MLA-referens (8:e uppl.)Não informado. Educational Research. National Foundation for Educational Research, 1958.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.