Gaya APA
Accurate english : intermediate level. (1989).
London:
Cassell Publisher Ltd.
Gaya Chicago
Accurate english : intermediate level.
.
London:
Cassell Publisher Ltd,
1989.
Text.
Gaya MLA
Accurate english : intermediate level.
.
London:
Cassell Publisher Ltd,
1989.
Text.
Gaya Turabian
Accurate english : intermediate level.
London:
Cassell Publisher Ltd,
1989.
Print.