Hofeditz, Calvin A. Computers and data processing made simple / Calvin A. Hofeditz. - 1st ed. - Garden City : Doubleday, 1979. - 144 p. : ill. ; 26 cm. - Made Simple Books . Open access. ISBN: 038514945X LCCN: 7822635 Subjects--Topical Terms: Electronic digital computers.Electronic data processing.