Hellerman, H Digital computer system principles H. Hellerman - 2nd ed. - New Delhi Tata McGraw-Hill 1974 - xiii, 466p. ISBN: 0-07-028073-8 Subjects--Topical Terms: Computer ProgrammingComputer ScienceData ProcessingDigital ComputersNASA Thesaurus Universal Decimal Class. No.: 519.68 / HEL