Howard, D. H. (1953). Effective communication: A guide to reading, writing, speaking, and listening. Prentice-hall.
Lua i Stíl Chicago (17ú heag.)Howard, Dean H. Effective Communication: A Guide to Reading, Writing, Speaking, and Listening. New York: Prentice-hall, 1953.
Lua MLA (9ú heag.)Howard, Dean H. Effective Communication: A Guide to Reading, Writing, Speaking, and Listening. Prentice-hall, 1953.
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