Gaya APA
Practical English Usage. (1995).
:
Oxford university press.
Gaya Chicago
Practical English Usage.
.
:
Oxford university press,
1995.
.
Gaya MLA
Practical English Usage.
.
:
Oxford university press,
1995.
.
Gaya Turabian
Practical English Usage.
:
Oxford university press,
1995.
.