APA Style
Manual on written business communication. (1994).
Singapore:
Ngee ann Polythecnic.
Chicago Style
Manual on written business communication.
.
Singapore:
Ngee ann Polythecnic,
1994.
Book.
MLA Style
Manual on written business communication.
.
Singapore:
Ngee ann Polythecnic,
1994.
Book.
Turabian Style
Manual on written business communication.
Singapore:
Ngee ann Polythecnic,
1994.
Book.