Gaya APA
Cooper. (2003).
BUSINESS RESEARCH METHODS .
SINGAPORE:
McGraw- Hill.
Gaya Chicago
Cooper.
BUSINESS RESEARCH METHODS.
SINGAPORE:
McGraw- Hill,
2003.
Text.
Gaya MLA
Cooper.
BUSINESS RESEARCH METHODS.
SINGAPORE:
McGraw- Hill,
2003.
Text.
Gaya Turabian
Cooper.
BUSINESS RESEARCH METHODS.
SINGAPORE:
McGraw- Hill,
2003.
Print.