Gaya APA
Business an introduction. (2003).
Jakarta:
Gramedia Pustaka Utama.
Gaya Chicago
Business an introduction.
Cet.2.
Jakarta:
Gramedia Pustaka Utama,
2003.
.
Gaya MLA
Business an introduction.
Cet.2.
Jakarta:
Gramedia Pustaka Utama,
2003.
.
Gaya Turabian
Business an introduction.
Jakarta:
Gramedia Pustaka Utama,
2003.
.