Boyd, W. P., & Lesikar, R. V. (1959). Productive business writing. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Boyd, William Paxton, agus Raymond Vincent Lesikar. Productive Business Writing. Englewood Cliffs, N.J: Prentice-Hall, 1959.
Lua MLA (9ú heag.)Boyd, William Paxton, agus Raymond Vincent Lesikar. Productive Business Writing. Prentice-Hall, 1959.
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