United States. Bureau of Labor Statistics. "BLS Reports on the Amount of Formal and Informal Training Received by Employees : BLS Reports on the Amount of Formal and Informal Training Received by Employees, USDL - 96-515,"
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https://fraser.stlouisfed.org/title/9679/item/707757/content/pdf/sept_19961219, accessed on September 12, 2026.