Gaya APA
Olii, Helena. (2007).
Public Speaking .
Jakarta:
PT Indeks.
Gaya Chicago
Olii, Helena.
Public Speaking.
Jakarta:
PT Indeks,
2007.
Text.
Gaya MLA
Olii, Helena.
Public Speaking.
Jakarta:
PT Indeks,
2007.
Text.
Gaya Turabian
Olii, Helena.
Public Speaking.
Jakarta:
PT Indeks,
2007.
Print.