Hawkins, B. L., & Preston, P. (1981). Managerial communication. Goodyear Pub.
Lua i Stíl Chicago (17ú heag.)Hawkins, Brian L., agus Paul Preston. Managerial Communication. Santa Monica, Calif: Goodyear Pub, 1981.
Lua MLA (9ú heag.)Hawkins, Brian L., agus Paul Preston. Managerial Communication. Goodyear Pub, 1981.
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