Não informado. (1971). Literacy Work. International Institute for Adult Literacy Methods.
Chicago-referens (17:e uppl.)Não informado. Literacy Work. Teheran: International Institute for Adult Literacy Methods, 1971.
MLA-referens (8:e uppl.)Não informado. Literacy Work. International Institute for Adult Literacy Methods, 1971.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.