Gaya APA
Check your english. (1990).
London:
Macmillan Publishers Ltd.
Gaya Chicago
Check your english.
.
London:
Macmillan Publishers Ltd,
1990.
Text.
Gaya MLA
Check your english.
.
London:
Macmillan Publishers Ltd,
1990.
Text.
Gaya Turabian
Check your english.
London:
Macmillan Publishers Ltd,
1990.
Print.