Gaya APA
Robsen, Brian. (1994).
Principles and Practice of Business Correspondence .
Singapura:
Composite Study Aid Publication.
Gaya Chicago
Robsen, Brian.
Principles and Practice of Business Correspondence.
Singapura:
Composite Study Aid Publication,
1994.
Buku.
Gaya MLA
Robsen, Brian.
Principles and Practice of Business Correspondence.
Singapura:
Composite Study Aid Publication,
1994.
Buku.
Gaya Turabian
Robsen, Brian.
Principles and Practice of Business Correspondence.
Singapura:
Composite Study Aid Publication,
1994.
Buku.