Gaya APA

Bradley, B, E. (1991). Fundamentals of Speech Communication. The Credibility of Ideas (6). Amerika Serikat: Wm. C. Brown Publishers.

Gaya MLA

Bradley, Bert, E.. "Fundamentals of Speech Communication. The Credibility of Ideas". 6 Amerika Serikat: Wm. C. Brown Publishers, 1991. .