Gaya APA
Gartside, L. (1991).
Model Business Letters .
S.l:
s.n.
Gaya Chicago
Gartside, L.
Model Business Letters.
S.l:
s.n,
1991.
Text Book.
Gaya MLA
Gartside, L.
Model Business Letters.
S.l:
s.n,
1991.
Text Book.
Gaya Turabian
Gartside, L.
Model Business Letters.
S.l:
s.n,
1991.
Text Book.