Gaya APA
Practical english usage. (1984).
New York:
Oxford University Press.
Gaya Chicago
Practical english usage.
.
New York:
Oxford University Press,
1984.
Text.
Gaya MLA
Practical english usage.
.
New York:
Oxford University Press,
1984.
Text.
Gaya Turabian
Practical english usage.
New York:
Oxford University Press,
1984.
Print.