APA Style
Business communication manual. ([s.a.]).
Singapore:
Ngee Ann Polytechnic.
Chicago Style
Business communication manual.
.
Singapore:
Ngee Ann Polytechnic,
[s.a.].
Book.
MLA Style
Business communication manual.
.
Singapore:
Ngee Ann Polytechnic,
[s.a.].
Book.
Turabian Style
Business communication manual.
Singapore:
Ngee Ann Polytechnic,
[s.a.].
Book.