United States. Bureau of Labor Statistics. "Employed Persons with a Job But Not at Work, by Reason, Pay Status, and Sex," in United States. Bureau of Labor Statistics. "March 1988," Employment and Earnings (March 1988) : 33-33. https://fraser.stlouisfed.org/scribd/?toc_id=353896&filepath=/files/docs/publications/employment/1980s/empl_031988.pdf&start_page=33 , accessed on April 24, 2018.