Não informado. (1971). British journal of mental subnormality. British Society for the Study of Mental Subnormality.
Chicago-referens (17:e uppl.)Não informado. British Journal of Mental Subnormality. Birmingham, Inglaterra: British Society for the Study of Mental Subnormality, 1971.
MLA-referens (8:e uppl.)Não informado. British Journal of Mental Subnormality. British Society for the Study of Mental Subnormality, 1971.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.