@book{1215,
	author = {SINGELMANN, JAY. and LONGHURST, JEAN.},
	title = {PROGRAMACION LOGICA APLICADA A  LA  ADMINISTRACION : },
	publisher = {PRENTICE-HALL HISPANOAMERICANA},
	year = {1987},
	address = {MEXICO: },
	note = {INCLUYE INDICE.}
}