Não informado. (1956). Social Work. National Association of Social Workers.
Chicago-viite (17. p.)Não informado. Social Work. Silver Spring, Md: National Association of Social Workers, 1956.
MLA-viite (8. p.)Não informado. Social Work. National Association of Social Workers, 1956.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.