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Dyfyniad Arddull ChicagoBali, N.P, P.N Gupta, and C.P Gandhi. A Textbook of Quantitative Techniques. New Delhi: Laxmi publications, 2008.
Dyfyniad MLABali, N.P, et al. A Textbook of Quantitative Techniques. Laxmi publications, 2008.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.