Παραπομπή σε μορφή APA (7η εκδ.)

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

Παραπομπή σε μορφή Chicago (17η εκδ.)

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

Παραπομπή σε μορφή MLA (9th εκδ.)

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