Não informado. (1947). Elementary English. National Council of Teachers of English.
Chicago-referens (17:e uppl.)Não informado. Elementary English. Champaign, Ill: National Council of Teachers of English, 1947.
MLA-referens (8:e uppl.)Não informado. Elementary English. National Council of Teachers of English, 1947.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.