Williams, C. B., & Ball, J. (1953). Effective business writing (2d ed.). Ronald Press Co.
Lua i Stíl Chicago (17ú heag.)Williams, Cecil Brown, agus John Ball. Effective Business Writing. 2d ed. New York: Ronald Press Co, 1953.
Lua MLA (9ú heag.)Williams, Cecil Brown, agus John Ball. Effective Business Writing. 2d ed. Ronald Press Co, 1953.
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