por Drooyan, Irving [autor] | Hadel, Walter [autor].
por Drooyan, Irving [autor] | Wooton, William [autor] | Perez Castellanos, Jose Hernan [traductor] | Drooyan, Irving. Elementary algebra for college students.
por Drooyan, Irving [autor] | Franklin, Katherine [autor] | Villagómez Velázquez, Hugo [traductor].