Gaya APA
Business essentials. (2011).
Boston:
Pearson Education Int..
Gaya Chicago
Business essentials.
8th ed..
Boston:
Pearson Education Int.,
2011.
Buku.
Gaya MLA
Business essentials.
8th ed..
Boston:
Pearson Education Int.,
2011.
Buku.
Gaya Turabian
Business essentials.
Boston:
Pearson Education Int.,
2011.
Buku.