@book{50493,
	author = {Tro, Nivaldo J.},
	title = {Introductory chemistry essentials /},
	publisher = {Pearson/Prentice Hall,},
	year = {2009},
	address = {Upper Saddle River, N.J. :},
	edition = {3rd ed.},
	note = {access mode www.masteringchemistry.com - click new students beneath register - click yes to indicate that you have an access code - follow the on-screen instruction to complete your registration - click log in now form the conformation and summary page},
	url = {http://www.loc.gov/catdir/toc/ecip085/2007048421.html}
}