Gaya APA
Business and Its Environment. (2003).
Amerika:
Prentice-Hall.
Gaya Chicago
Business and Its Environment.
Ed. 4.
Amerika:
Prentice-Hall,
2003.
.
Gaya MLA
Business and Its Environment.
Ed. 4.
Amerika:
Prentice-Hall,
2003.
.
Gaya Turabian
Business and Its Environment.
Amerika:
Prentice-Hall,
2003.
.