Sigband, N. B. (1969). Communication for management and business. Scott, Foresman.
Lua i Stíl Chicago (17ú heag.)Sigband, Norman B. Communication for Management and Business. Illinois: Scott, Foresman, 1969.
Lua MLA (9ú heag.)Sigband, Norman B. Communication for Management and Business. Scott, Foresman, 1969.
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