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