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