A model survey of computer services / Department of International Economic and Social Affairs, Statistical Office. - New York : United Nations, 1991. - iv, 36 p. ; 28 cm. - Statistical papers. Series M ; no. 81 . "ST/ESA/STAT/SER.M/81." "United Nations publication sales no. E.91.XVII.12"--T.p. verso. ISBN: 9211613388 LCCN: 93123112 Subjects--Topical Terms: Computer service industry--Statistical methods.Bilgisayar servis endüstrisi--İstatistiksel yöntemler LC Class. No.: HD9696.C62 / M62 1991 Dewey Class. No.: 338.761 / MOD 1991