Institute of Business Science, International Correspondence Schools, & Stratton, C. (1923). The key to good letter writing. Institute of Business Science.
Citace podle Chicago (17th ed.)Institute of Business Science, International Correspondence Schools, a Clarence Stratton. The Key to Good Letter Writing. Scranton, Penn: Institute of Business Science, 1923.
Citace podle MLA (9th ed.)Institute of Business Science, et al. The Key to Good Letter Writing. Institute of Business Science, 1923.
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