United States. Bureau of Employment Security. (1955). National employment services, United States. International Labour Office.
芝加哥风格引文United States. Bureau of Employment Security. National Employment Services, United States. Geneva: International Labour Office, 1955.
MLA引文United States. Bureau of Employment Security. National Employment Services, United States. International Labour Office, 1955.
警告：这些引文格式不一定是100％准确.