@book{239,
	author = {Francis W. Sears and W. Sears, Francis, W. Zemansky, Mark, D. Young, Hugh, A. Freedman, Roger,  },
	title = {Física universitaria /},
	publisher = {Pearsons Educación,},
	year = {1996.},
	address = {México :},
	edition = {9a ed.},
	note = {Título en Inglés: University phisics}
}