@book{203009,
	author = {Marcus, Alfred Allen and Buitrago Valencia, Affán.},
	title = {Empresas ganadoras y empresas perdedoras},
	publisher = {Grupo Editorial Norma},
	year = {2006.},
	address = {Bogotá},
	url = {http://www.loc.gov/catdir/toc/ecip0514/2005016645.html}
}