@book{214506,
	author = {Vélez Torres, José Ramón. and Fraticelli Torres, Migdalia.},
	title = {Derecho de obligaciones :},
	publisher = {Programa de Educación Jurídica Continua, Facultad de Derecho, Universidad Interamericana de Puerto Rico ,},
	year = {1997.},
	address = {San Juan, P.R. :},
	edition = {2nd ed.},
	note = {Include index}
}