@book{7694,
	author = {Daniels, Douglas. and International Development Research Centre (Canada)},
	title = {Defining critical mass :},
	publisher = {International Development Research Centre,},
	year = {c1993.},
	address = {Ottawa :},
	url = {http://www.loc.gov/catdir/enhancements/fy1411/94113894-d.html}
}