Gaya APA
English for Business and Office. (2009).
Jakarta:
Universitas Terbuka.
Gaya Chicago
English for Business and Office.
Ed. 1 Cet. 1.
Jakarta:
Universitas Terbuka,
2009.
.
Gaya MLA
English for Business and Office.
Ed. 1 Cet. 1.
Jakarta:
Universitas Terbuka,
2009.
.
Gaya Turabian
English for Business and Office.
Jakarta:
Universitas Terbuka,
2009.
.