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