Sigband, N. B. (1981). Communicating in business. Scott, Foreman and Company.
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Dyfyniad Arddull Chicago
Sigband, Norman B. Communicating in Business. Illinois: Scott, Foreman and Company, 1981.
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Dyfyniad MLA
Sigband, Norman B. Communicating in Business. Scott, Foreman and Company, 1981.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.