Gaya APA
English Commericial Practice and Correspondence. (1980).
:
Longman.
Gaya Chicago
English Commericial Practice and Correspondence.
.
:
Longman,
1980.
.
Gaya MLA
English Commericial Practice and Correspondence.
.
:
Longman,
1980.
.
Gaya Turabian
English Commericial Practice and Correspondence.
:
Longman,
1980.
.