Gaya APA
Essential of control. (1996).
England:
Longman.
Gaya Chicago
Essential of control.
.
England:
Longman,
1996.
Text.
Gaya MLA
Essential of control.
.
England:
Longman,
1996.
Text.
Gaya Turabian
Essential of control.
England:
Longman,
1996.
Print.