Gaya APA
Barker, Alan. (2000).
Improve Your Communication Skills .
Jakarta:
Elex Media Komputindo.
Gaya Chicago
Barker, Alan.
Improve Your Communication Skills.
Jakarta:
Elex Media Komputindo,
2000.
Text.
Gaya MLA
Barker, Alan.
Improve Your Communication Skills.
Jakarta:
Elex Media Komputindo,
2000.
Text.
Gaya Turabian
Barker, Alan.
Improve Your Communication Skills.
Jakarta:
Elex Media Komputindo,
2000.
Print.