Shurter, R. L., & Nichols, F. G. (1948). Effective letters in business. McGraw-Hill Book Co.
Citace podle Chicago (17th ed.)Shurter, Robert L., a Frederick George Nichols. Effective Letters in Business. New York: McGraw-Hill Book Co, 1948.
Citace podle MLA (8th ed.)Shurter, Robert L., a Frederick George Nichols. Effective Letters in Business. McGraw-Hill Book Co, 1948.
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