Encyclopaedic dictionary of statistics: Vol.1 - O.P. Gupta; P.K. Mittal M.P. Gupta (New Delhi Anmol Publications Pvt. Ltd, 1989)
O.P. Gupta; P.K. Mittal & M.P. Gupta: Encyclopaedic dictionary of statistics: Vol.1. New Delhi. Anmol Publications Pvt. Ltd,, 1989. 81-7041-166-1--(519.03GUP)
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