1. Business Roundtable. (1980). Scheduled overtime effect on construction projects . The Business Roundtable New York N.Y.
2. “Davis‐Bacon Act.” (1985a). U.S. Code Title 40 Section 276A U.S. Government Printing Office Washington D.C.
3. “Hours of work and output ” (1947). U.S. Department of Labor Bulletin No. 917 U.S. Government Printing Office Washington D.C.
4. Maurice M. (1975). Shiftwork . International Labour Organisation Imprimerie Vaudoise Lausanne Switzerland.
5. Nollen S. D. and Martin V. H. (1978). Alternative work schedules Parts 2 and 3 . American Management Assoc. New York N.Y.