United States. Bureau of Employment Security. (1955). National employment services, United States. International Labour Office.
Παραπομπή σε μορφή Chicago (17η εκδ.)United States. Bureau of Employment Security. National Employment Services, United States. Geneva: International Labour Office, 1955.
Παραπομπή σε μορφή MLA (9th εκδ.)United States. Bureau of Employment Security. National Employment Services, United States. International Labour Office, 1955.
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