APA Style
Olli, Helena. (2008).
Public speaking .
Jakarta:
PT Indira.
Chicago Style
Olli, Helena.
Public speaking.
Jakarta:
PT Indira,
2008.
Buku Koleksi.
MLA Style
Olli, Helena.
Public speaking.
Jakarta:
PT Indira,
2008.
Buku Koleksi.
Turabian Style
Olli, Helena.
Public speaking.
Jakarta:
PT Indira,
2008.
Buku Koleksi.