Gaya APA
Speaking upper-intermediate Roger Gower. (1987).
:
.
Gaya Chicago
Speaking upper-intermediate Roger Gower.
Fourth ed.
:
,
1987.
.
Gaya MLA
Speaking upper-intermediate Roger Gower.
Fourth ed.
:
,
1987.
.
Gaya Turabian
Speaking upper-intermediate Roger Gower.
:
,
1987.
.