@book{541479,
	author = {Callahan, Michael T. and Quackenbush, Daniel G.},
	title = {Construction project scheduling /},
	publisher = {McGraw-Hill,},
	year = {c1992.},
	address = {New York :},
	url = {http://www.loc.gov/catdir/toc/mh021/91036133.html}
}