VALENTI JACK. (1982). SPEAK UP WITH CONFIDENCE: HOW TO PREPARE,LEARN & DELIVER... SPEECHES. WILLIAM MORROW.
Style de citation Chicago (17e éd.)VALENTI JACK. SPEAK UP WITH CONFIDENCE: HOW TO PREPARE,LEARN & DELIVER... SPEECHES. NEW YORK: WILLIAM MORROW, 1982.
Style de citation MLA (9e éd.)VALENTI JACK. SPEAK UP WITH CONFIDENCE: HOW TO PREPARE,LEARN & DELIVER... SPEECHES. WILLIAM MORROW, 1982.
Attention : ces citations peuvent ne pas être correctes à 100%.