Gaya APA
Office Administration. (1977).
London:
Pitman.
Gaya Chicago
Office Administration.
~.
London:
Pitman,
1977.
Buku.
Gaya MLA
Office Administration.
~.
London:
Pitman,
1977.
Buku.
Gaya Turabian
Office Administration.
London:
Pitman,
1977.
Buku.