@book{132408,
	author = {Velásquez Bastidas, Wilson.},
	title = {Cálculo Integral :},
	publisher = {Editorial Unimagdalena,},
	year = {2014.},
	address = {Santa Marta :},
	note = {Incluye índice.},
	url = {https://elibro.net/ereader/politecnicointernacional/70095}
}