Gaya APA
Siahaan,Janpie. (2009).
Managing Competition .
Jakarta:
Saemba Empat.
Gaya Chicago
Siahaan,Janpie.
Managing Competition.
Jakarta:
Saemba Empat,
2009.
Text.
Gaya MLA
Siahaan,Janpie.
Managing Competition.
Jakarta:
Saemba Empat,
2009.
Text.
Gaya Turabian
Siahaan,Janpie.
Managing Competition.
Jakarta:
Saemba Empat,
2009.
Print.