@book{542068,
	author = {Halpin, Daniel W. and Halpin, Daniel W.},
	title = {Planning and analysis of construction operations /},
	publisher = {Wiley,},
	year = {c1992.},
	address = {New York :},
	note = {"A Wiley Interscience publication."},
	url = {http://www.loc.gov/catdir/toc/onix04/91032231.html}
}