https://books.google.com.pe/books?id=KD8ZZ66PF-gC&pg=PA224&dq=BASE+DE+DATOS+SISTEMA+DE+INFORMACION&hl=es-419&sa=X&ei=ljkzVYPqH4XbsATgqYHoBA&ved=0CDMQ6AEwBA#v=onepage&q=BASE%20DE%20DATOS%20SISTEMA%20DE%20INFORMACION&f=false…
