APA aipamena

VALENTI JACK. (1982). SPEAK UP WITH CONFIDENCE: HOW TO PREPARE,LEARN & DELIVER... SPEECHES. WILLIAM MORROW.

Chicago Style aipamena

VALENTI JACK. SPEAK UP WITH CONFIDENCE: HOW TO PREPARE,LEARN & DELIVER... SPEECHES. NEW YORK: WILLIAM MORROW, 1982.

MLA aipamena

VALENTI JACK. SPEAK UP WITH CONFIDENCE: HOW TO PREPARE,LEARN & DELIVER... SPEECHES. WILLIAM MORROW, 1982.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.