Gaya APA
Grammar and practice. (1989).
tempaterbit:
penerbit.
Gaya Chicago
Grammar and practice.
Edisi.
tempaterbit:
penerbit,
1989.
Text.
Gaya MLA
Grammar and practice.
Edisi.
tempaterbit:
penerbit,
1989.
Text.
Gaya Turabian
Grammar and practice.
tempaterbit:
penerbit,
1989.
Print.