@book{167765,
	author = {Yebes López, Elvira. and Martínez Valero, Julián},
	title = {Guía visual de Excel 97},
	publisher = {Anaya Multimedia},
	year = {1997, 1999.},
	series = {Guías visuales},
	address = {Madrid},
	edition = {1ra.ed. ; 7a. reimpr.}
}