Gaya APA
Joseph, H.
(1989).
Guide to Professional & Business Correspondence
(
Cet. 1)
.
Jakarta:
Pusaka Binanma Pressndo.
Gaya MLA
Joseph, Harvard.
"Guide to Professional & Business Correspondence".
Cet. 1
Jakarta:
Pusaka Binanma Pressndo,
1989.
Text.