1. Bureau of Labor Statistics (U.S. Department of Labor). Employment situation summary. Report No. USDL 08-1367. 2008.
2. A time to work: recent trends in shift work and flexible schedules;McMenamin;Monthly Labor Rev,2007
3. New South Wales Labour Economics Office. Supplement to the September 2001 labour market report [online]. Vol. 2008; 2001.
4. Time and work: duration of work;Boisard,2003
5. Bureau of Labor Statistics. Current Population Survey, May 2004: Work schedules and work at home supplement. Report No. 4346. 2004.