Gaya APA
Wordpower. (1990).
London:
Intl Center for Creative Thinking.
Gaya Chicago
Wordpower.
.
London:
Intl Center for Creative Thinking,
1990.
Text.
Gaya MLA
Wordpower.
.
London:
Intl Center for Creative Thinking,
1990.
Text.
Gaya Turabian
Wordpower.
London:
Intl Center for Creative Thinking,
1990.
Print.