Parkhurst, C. C. (1960). Case studies and problems in business communications. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Parkhurst, Charles Chandler. Case Studies and Problems in Business Communications. Englewood Cliffs, N. J: Prentice-Hall, 1960.
Lua MLA (9ú heag.)Parkhurst, Charles Chandler. Case Studies and Problems in Business Communications. Prentice-Hall, 1960.
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