Lefferts, R. (1981). Elements of graphics: How to prepare charts and graphs for effective reports. Harper & Row.
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Dyfyniad Arddull Chicago
Lefferts, Robert. Elements of Graphics: How to Prepare Charts and Graphs for Effective Reports. New York ; London: Harper & Row, 1981.
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Dyfyniad MLA
Lefferts, Robert. Elements of Graphics: How to Prepare Charts and Graphs for Effective Reports. Harper & Row, 1981.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.