Gaya APA
HARVARD, Joseph. (2001).
Guide to professional and Business correspondence .
Jakarta:
PPM.
Gaya Chicago
HARVARD, Joseph.
Guide to professional and Business correspondence.
Jakarta:
PPM,
2001.
Text.
Gaya MLA
HARVARD, Joseph.
Guide to professional and Business correspondence.
Jakarta:
PPM,
2001.
Text.
Gaya Turabian
HARVARD, Joseph.
Guide to professional and Business correspondence.
Jakarta:
PPM,
2001.
Print.