@book{212008,
	author = {Frank, Robert H. and Bernanke, Ben.},
	title = {Principles of economics},
	publisher = {McGraw-Hill/Irwin},
	year = {c2012.},
	address = {Boston},
	edition = {3rd ed.},
	note = {Various multi-media instructional aids, including web sites, are available to supplement the text.}
}