DAVIS, HARMER E ELEMENTARY STRUCTURED COBOL: A STEP BY STEP APPROACH - S.E. - Estados Unidos MCGRAW-HILL 1977 NEW YORK - 312 ISBN: 0070157820 LCCN: 1376 Subjects--Topical Terms: COBOL (LENGUAJE DE PROGRAMACION) Dewey Class. No.: 001.6424