APA Style
Ideas are free. (2004).
San Francisco:
Berret-Koehler.
Chicago Style
Ideas are free.
.
San Francisco:
Berret-Koehler,
2004.
.
MLA Style
Ideas are free.
.
San Francisco:
Berret-Koehler,
2004.
.
Turabian Style
Ideas are free.
San Francisco:
Berret-Koehler,
2004.
.