Gaya APA
Boohrer, D.
(1991).
Executive Portofolio of Model Speeches for All Occasions
(
pertama)
.
USA:
Prentice hall.
Gaya MLA
Boohrer, Dianna.
"Executive Portofolio of Model Speeches for All Occasions".
pertama
USA:
Prentice hall,
1991.
Teksbook.