Gaya APA
Umar, Husein. (2013).
Business : an introduction (ed.1).
Medan:
cipta agung.
Gaya Chicago
Umar, Husein.
Business : an introduction.
ed.1
Medan:
cipta agung,
2013.
HUKUM.
Gaya MLA
Umar, Husein.
Business : an introduction.
ed.1
Medan:
cipta agung,
2013.
HUKUM.
Gaya Turabian
Umar, Husein.
Business : an introduction.
ed.1
Medan:
cipta agung,
2013.
HUKUM.