Gaya APA
Alexander, LG. (2000).
First Things First students' book .
New York:
.
Gaya Chicago
Alexander, LG.
First Things First students' book.
New York:
,
2000.
Text.
Gaya MLA
Alexander, LG.
First Things First students' book.
New York:
,
2000.
Text.
Gaya Turabian
Alexander, LG.
First Things First students' book.
New York:
,
2000.
Print.