Witte, R. S. (1993). Statistics (4th ed.). Harcourt Brace.
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Dyfyniad Arddull Chicago
Witte, Robert S. Statistics. 4th ed. San Diego: Harcourt Brace, 1993.
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Dyfyniad MLA
Witte, Robert S. Statistics. 4th ed. Harcourt Brace, 1993.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.