APA Style
Manual on verbal business communication. (1991).
Singapore:
Ngee Ann Polytechnic.
Chicago Style
Manual on verbal business communication.
.
Singapore:
Ngee Ann Polytechnic,
1991.
Book.
MLA Style
Manual on verbal business communication.
.
Singapore:
Ngee Ann Polytechnic,
1991.
Book.
Turabian Style
Manual on verbal business communication.
Singapore:
Ngee Ann Polytechnic,
1991.
Book.