United States. Office of Management and Budget. "Executive Branch Civilian Full-Time Equivalent Employment," in United States. Office of Management and Budget. "Fiscal Year 2013," Historical Tables, Budget of the United States Government (February 13, 2012) : 359-360. https://fraser.stlouisfed.org/title/383/item/6439/toc/220781 , accessed on April 23, 2024.