WEISS DONALD H. (1987). HOW TO MAKE AN EFFECTIVE SPEECH OR PRESENTATION. AMACOM.
Lua i Stíl Chicago (17ú heag.)WEISS DONALD H. HOW TO MAKE AN EFFECTIVE SPEECH OR PRESENTATION. NEW YORK: AMACOM, 1987.
Lua MLA (9ú heag.)WEISS DONALD H. HOW TO MAKE AN EFFECTIVE SPEECH OR PRESENTATION. AMACOM, 1987.
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