Gaya APA
Practical English Business Correspondence. (2007).
:
.
Gaya Chicago
Practical English Business Correspondence.
Cet. 1.
:
,
2007.
Text.
Gaya MLA
Practical English Business Correspondence.
Cet. 1.
:
,
2007.
Text.
Gaya Turabian
Practical English Business Correspondence.
:
,
2007.
Print.