Gaya APA
Davy, Derek. (1977).
Advanced English course .
London:
Linguaphone Institute Limited .
Gaya Chicago
Davy, Derek.
Advanced English course.
London:
Linguaphone Institute Limited ,
1977.
Text.
Gaya MLA
Davy, Derek.
Advanced English course.
London:
Linguaphone Institute Limited ,
1977.
Text.
Gaya Turabian
Davy, Derek.
Advanced English course.
London:
Linguaphone Institute Limited ,
1977.
Print.