Gaya APA
For busy people. (2007).
tempaterbit:
penerbit.
Gaya Chicago
For busy people.
Edisi.
tempaterbit:
penerbit,
2007.
Text.
Gaya MLA
For busy people.
Edisi.
tempaterbit:
penerbit,
2007.
Text.
Gaya Turabian
For busy people.
tempaterbit:
penerbit,
2007.
Print.