Sigband, N. B. (1981). Communicating in business. Scott, Foreman and Company.
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Chicago-čujuhus (17. p.)
Sigband, Norman B. Communicating in Business. Illinois: Scott, Foreman and Company, 1981.
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MLA-čujuhus (9. p.)
Sigband, Norman B. Communicating in Business. Scott, Foreman and Company, 1981.
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