Here are some primary sources: http://micsymposium.org/mics_2011_proceedings/mics11_olson.p...

http://psychclassics.yorku.ca/Munster/Industrial/chap17.htm

http://www.danzpage.com/Construction-Management-Resources/Ca...

https://www.construction-institute.org/scriptcontent/more/sd...

http://classes.engineering.wustl.edu/2009/spring/jme4900/Art...

http://cmdept.unl.edu/drb/Reading/overtime2.htm