APA Style
Thirty Days to More Powerful Writing. (1981).
Indonesia:
Elex Media Komputindo.
Chicago Style
Thirty Days to More Powerful Writing.
1st edition.
Indonesia:
Elex Media Komputindo,
1981.
Text.
MLA Style
Thirty Days to More Powerful Writing.
1st edition.
Indonesia:
Elex Media Komputindo,
1981.
Text.
Turabian Style
Thirty Days to More Powerful Writing.
Indonesia:
Elex Media Komputindo,
1981.
Print.