(1957). The fortieth session of the International Labour Conference: Geneva, June 1957. International Labour Organization.
Citazione stile Chigago Style (17a edizione)The Fortieth Session of the International Labour Conference: Geneva, June 1957. International Labour Organization, 1957.
Citatione MLA (9a ed.)The Fortieth Session of the International Labour Conference: Geneva, June 1957. International Labour Organization, 1957.
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