Gaya APA
Tracy, Brian. (2001).
Focal Point .
USA:
Amacom.
Gaya Chicago
Tracy, Brian.
Focal Point.
USA:
Amacom,
2001.
Text.
Gaya MLA
Tracy, Brian.
Focal Point.
USA:
Amacom,
2001.
Text.
Gaya Turabian
Tracy, Brian.
Focal Point.
USA:
Amacom,
2001.
Print.