Gaya APA
Ferriss, Timothy. (2009).
The 4 - Hour Workweek .
California:
Harmony Books.
Gaya Chicago
Ferriss, Timothy.
The 4 - Hour Workweek.
California:
Harmony Books,
2009.
Text.
Gaya MLA
Ferriss, Timothy.
The 4 - Hour Workweek.
California:
Harmony Books,
2009.
Text.
Gaya Turabian
Ferriss, Timothy.
The 4 - Hour Workweek.
California:
Harmony Books,
2009.
Print.