Não informado. (1947). Elementary English. National Council of Teachers of English.
Style de citation Chicago (17e éd.)Não informado. Elementary English. Champaign, Ill: National Council of Teachers of English, 1947.
Style de citation MLA (8e éd.)Não informado. Elementary English. National Council of Teachers of English, 1947.
Attention : ces citations peuvent ne pas être correctes à 100%.