@book{14191,
	author = {Pinto Loaiza, Lizeth Denila and Villanueva Leal, Jaime Vicente},
	title = {Cambios en las obligaciones formales, Espinal / },
	publisher = {Instituto Tolimense de Formación Técnica Profesional - ITFIP},
	year = {2013},
	address = {El Espinal, Tolima}
}