Gaya APA
Gartside, L. (1993).
Model Business Letters .
Singapore:
Pitman Publishing.
Gaya Chicago
Gartside, L.
Model Business Letters.
Singapore:
Pitman Publishing,
1993.
Text.
Gaya MLA
Gartside, L.
Model Business Letters.
Singapore:
Pitman Publishing,
1993.
Text.
Gaya Turabian
Gartside, L.
Model Business Letters.
Singapore:
Pitman Publishing,
1993.
Print.