International Labour Office. (1967). The cost of social security, sixth international inquiry, 1961-1963 =: Le Cout de la securite sociale, sixieme enquete internationale, 1961-1963 = El Costo de la seguridad social, sexta encuesta internacional, 1961-1963. International Labor Office.
芝加哥风格引文International Labour Office. The Cost of Social Security, Sixth International Inquiry, 1961-1963 =: Le Cout De La Securite Sociale, Sixieme Enquete Internationale, 1961-1963 = El Costo De La Seguridad Social, Sexta Encuesta Internacional, 1961-1963. Geneva: International Labor Office, 1967.
MLA引文International Labour Office. The Cost of Social Security, Sixth International Inquiry, 1961-1963 =: Le Cout De La Securite Sociale, Sixieme Enquete Internationale, 1961-1963 = El Costo De La Seguridad Social, Sexta Encuesta Internacional, 1961-1963. International Labor Office, 1967.