@book {19056,
	title = {Principles of Economics, 5th edition},
	year = {2011},
	note = {The Introductory-Level Textbook},
	publisher = {South-Western Cengage Learning},
	organization = {South-Western Cengage Learning},
	url = {http://mankiw.swlearning.com/},
	author = {N.G. Mankiw}
}
