Gaya APA
Olii, Helena. (2008).
Public speaking .
Jakarta:
PT Indeks.
Gaya Chicago
Olii, Helena.
Public speaking.
Jakarta:
PT Indeks,
2008.
Text.
Gaya MLA
Olii, Helena.
Public speaking.
Jakarta:
PT Indeks,
2008.
Text.
Gaya Turabian
Olii, Helena.
Public speaking.
Jakarta:
PT Indeks,
2008.
Print.