Gupta, C. B. An introduction to statistical methods. - 9th. rev. ed. - New Delhi: Vikas Publishing House Pvt. Ltd., 1995. - x, 771p.; 22cm "N" ISBN: "0-7069-9954-1" Subjects--Topical Terms: 1.Statistical methods 2. Statistics 3. Social sciences Subjects--Index Terms: "N" LC Class. No.: HA29 / .G87