Gaya APA
Gartside, L.. (1989).
Model Business Letters (3rd ed).
Jakarta:
Binarupa Aksara.
Gaya Chicago
Gartside, L..
Model Business Letters.
3rd ed
Jakarta:
Binarupa Aksara,
1989.
Text.
Gaya MLA
Gartside, L..
Model Business Letters.
3rd ed
Jakarta:
Binarupa Aksara,
1989.
Text.
Gaya Turabian
Gartside, L..
Model Business Letters.
3rd ed
Jakarta:
Binarupa Aksara,
1989.
Print.