Não informado. (1971). Literacy Work. International Institute for Adult Literacy Methods.
Chicago-viite (17. p.)Não informado. Literacy Work. Teheran: International Institute for Adult Literacy Methods, 1971.
MLA-viite (8. p.)Não informado. Literacy Work. International Institute for Adult Literacy Methods, 1971.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.